The Science of Smiling in Professional Photos: What Your Expression Actually Communicates
The question of whether to smile in a professional headshot, and if so how, is one that most professionals have opinions about but that research has addressed quite specifically. The science of smiling in professional contexts is more nuanced and more interesting than the simple choice between smiling and not smiling, and understanding it helps you make deliberate choices that serve your professional photography goals.
Research consistently finds that smiling significantly improves perceptions of warmth and approachability in professional photographs, which are among the most consequential qualities that professional audiences evaluate. But not all smiles are equal, and the specific difference between a genuine smile and a performed one is something that human observers detect with remarkable accuracy, often without being consciously aware that they are doing so.
The Duchenne smile, named after nineteenth-century French neurologist Guillaume Duchenne who first described it, is the key distinction. A genuine Duchenne smile involves the activation of two specific facial muscles simultaneously: the zygomaticus major, which raises the corners of the mouth, and the orbicularis oculi, which raises the cheeks and creates the characteristic crinkling at the outer corners of the eyes. The zygomaticus major can be contracted voluntarily, but the orbicularis oculi is very difficult to activate deliberately without genuinely feeling positive emotion. This makes the Duchenne smile a reliable indicator of genuine positive feeling and the specific marker that audiences use, unconsciously and accurately, to detect genuine versus performed smiles.
The consequences of this distinction for professional photographs are significant. Research finds that Duchenne smiles produce dramatically stronger positive responses than non-Duchenne smiles in terms of perceived trustworthiness, likability, and sociability. Remarkably, one study found that the intensity of genuine smiling in yearbook photographs predicted life outcomes including longevity decades later, with subjects displaying Duchenne smiles in their yearbook photos being only half as likely to die in any given year as those without. This finding, while it has been replicated in different forms, suggests that genuine positive expression is associated with genuine wellbeing in ways that cameras capture and that matter beyond professional photography.
This article covers the science of smiling in professional photography in depth, including the research on how different smile qualities are perceived, how to produce genuine rather than performed smiles in a photography context, whether to smile at all in specific professional contexts, and the practical tools for getting the expression right in your headshot session.
The Duchenne Smile and Why It Matters
Understanding the Duchenne smile in enough detail to know what you are working toward, and to recognize it when it appears in your photographs, is the foundation of effective smile management in professional photography.
The zygomaticus major muscle raises the corners of the mouth in what is recognizable as a smile. This muscle responds to voluntary command and is the muscle that produces performed smiles. When you are asked to smile for a photograph and you produce a mouth smile, this is zygomaticus major at work. The problem is that this smile alone, without the simultaneous activation of the orbicularis oculi, produces what researchers call a non-Duchenne smile, one that is recognizable to most observers as not entirely genuine.
The orbicularis oculi encircles the eye and when contracted raises the cheeks, slightly narrows the eyes, and creates the characteristic wrinkles at the outer corners of the eyes that are often called crow's feet or laugh lines. When this muscle activates simultaneously with the zygomaticus major, the overall quality of the smile is fundamentally different: the cheeks are lifted and rounded, the eyes take on a warmer and more engaged quality, and the entire face participates in the smile rather than just the mouth. This is what observers identify as a genuine smile, and it produces correspondingly stronger positive responses.
The orbicularis oculi is much harder to activate voluntarily. Most people cannot reliably produce full orbicularis oculi contraction on demand without actually feeling something positive. This is why directed smiles in photographs so often look performed: the instruction "smile" activates the zygomaticus major but not typically the orbicularis oculi, producing the non-Duchenne smile that observers identify as performed. The implication for photography sessions is that the most effective way to produce a Duchenne smile is to produce genuine positive emotion rather than to direct the muscles to perform a smile.
Research on observer responses to Duchenne versus non-Duchenne smiles shows that observers perceive Duchenne smilers as significantly more trustworthy, more likable, and more generosity-signaling than those with non-Duchenne smiles. Remarkably, people report experiencing genuine pleasure themselves when viewing Duchenne smiles, with the strength of this response correlating with the observer's level of empathy. The genuine smile produces a genuine positive response in the viewer that the performed smile does not.
The specific visual markers of the Duchenne smile that you can look for in your own photographs are: the raising and rounding of the cheeks, the narrowing of the eye aperture slightly from above, the visible crinkling at the outer corners of the eyes, and the overall quality of the entire face being engaged in the smile rather than just the mouth area. When these markers are present, you have a Duchenne smile. When the mouth is raised but the eye area shows no specific engagement or crinkling, you have a non-Duchenne smile.
How to Produce Genuine Smiles in Photography Sessions
Producing Duchenne smiles in photography sessions requires specific conditions and approaches that are different from simply asking for a smile.
Genuine humor is the most reliable trigger for Duchenne smiles in photography contexts. Laughing at something genuinely funny, not politely chuckling at something mildly amusing but actually finding something funny, activates the full facial muscle engagement of a genuine positive response. Photographers who create conditions of genuine humor in their sessions, whether through genuine wit, through genuinely funny observations about the photography process, or through other forms of genuine comedy that land naturally in the session, produce better Duchenne smile photographs than those who try to direct smiles through instruction.
Genuine recall of positive memories is a reliable Duchenne smile technique. Being directed to think about something specific that makes you genuinely happy, a person you love, a moment of genuine professional pride, a place you love, activates real emotional responses that produce genuine facial expressions including genuine Duchenne smiles when the recalled memory is genuinely positive. The key is that the recalled memory needs to be genuinely positive for this to work: going through the motions of recalling something positive without actually feeling the positive emotion produces a performed rather than genuine response.
Genuine conversation about meaningful topics, where the photography subject becomes genuinely absorbed in discussing something they care about, naturally produces a range of genuine expressions including genuine smiles. A photographer who is genuinely curious about the person in front of them, who asks real questions about things that genuinely matter to the subject, and who listens with genuine attention to the answers, creates the conditions for genuine expressiveness that includes genuine smiles as a natural component of genuine conversational engagement.
The technique of almost-laughing, holding the beginning of genuine laughter without letting it go all the way, produces a specific quality of smile that is often among the most effective professional headshot expressions: the genuine quality of a real laugh with a slightly more contained expression that is appropriate for a professional photograph. Photographers who know this technique use triggers to bring subjects to the edge of genuine laughter and then capture the expression as it settles from full laugh to the warmer, more contained version.
The self-consciousness of being photographed is the primary obstacle to genuine smiling in photography sessions, because self-consciousness produces monitoring and monitoring produces performed rather than genuine responses. The best approach to reducing self-consciousness in sessions is genuine engagement with something other than the act of being photographed, genuine absorption in real conversation, real humor, or real positive recall that temporarily suspends the self-monitoring that produces performed expressions.
Should You Smile in Professional Headshots?
The question of whether to smile in professional headshots at all is worth addressing directly, because different professional contexts have genuinely different optimal smile approaches.
Research on professional photograph preferences consistently finds that smiling photographs produce stronger responses on the dimensions of warmth, approachability, and likability, while non-smiling photographs produce stronger responses on the dimensions of authority, competence, and power. The right balance depends on which dimensions your specific professional context most requires and which dimensions are most likely to produce the outcomes you are seeking from your professional photography.
For most client-facing service professionals, including healthcare providers, therapists, coaches, lawyers, financial advisors, real estate agents, and anyone whose business depends on building trust and approachability with individual clients, a genuine warm smile is almost always the more effective choice. The warmth and approachability benefits of smiling are specifically relevant for professionals whose primary professional challenge is being chosen over competitors rather than being taken seriously as an authority.
For professionals in formal authority contexts, including senior executives, judges, government officials, and institutional leaders whose professional role specifically requires projecting formal authority and institutional gravity, a more serious and composed expression can be more appropriate than a warm smile. The authority signal of composed seriousness may be more relevant for their specific professional context than the warmth signal of a genuine smile.
For most professionals, a composed but warm expression with a genuine, moderate smile is the most broadly effective choice. This expression threads the needle between the authority of seriousness and the warmth of a full smile, communicating both professional competence and genuine human warmth. The specific calibration depends on the professional context, with corporate and institutional professionals toward the more composed end and service and wellness professionals toward the warmer smile end.
Having multiple expressions from a single session, including both warmer-smile and more-composed versions, gives you the flexibility to use different images for different professional contexts and different audience needs. A more serious expression for formal institutional contexts and a warmer expression for LinkedIn and client-facing materials allows you to serve the full range of your professional needs from a single session investment.
The Closed-Mouth Smile and Its Specific Uses
The closed-mouth smile, technically the Mona Lisa smile or the Giaconda expression, occupies a specific middle ground between the full open smile and the serious composed expression, and it has specific professional uses.
The closed-mouth smile communicates warmth and positive engagement without the full expressiveness of an open smile. It reads as warm and pleasant while retaining a quality of composed professional authority that the full open smile sometimes lacks. This specific combination, warmth plus composure, is specifically effective for formal professional contexts where warmth is an asset but the full smile might seem too casual or too eager.
Many of the most effective executive, legal, and institutional professional headshots use this composed closed-mouth smile approach. The specific quality of settled, warm composure that a well-executed closed-mouth smile conveys, the sense of a person who is genuinely warm but who is also fully in command of their professional situation, is difficult to achieve with either a full open smile or a fully serious expression.
The technical challenge of the closed-mouth smile is producing a genuine version of it rather than a strained version. A forced closed-mouth smile, where the lip corners are pulled back without genuine warmth in the eyes and face, reads as specifically uncomfortable and can produce worse results than either a genuine open smile or a fully serious expression. The Duchenne quality is just as important for closed-mouth smiles as for open ones: the eyes need to show genuine warmth for the closed-mouth smile to achieve its intended effect.
Thinking about something that produces warm positive feelings, a gentle and pleasant memory or a person you genuinely like and are at ease with, tends to produce the natural, warm closed-mouth expression more reliably than instructions to show a specific expression. When genuine warmth is present in the emotional state, it tends to show in the face in ways that are consistent with the expression being aimed for, and the natural quality of the expression is almost always preferable to the directed performance of it.
The closed-mouth smile is also appropriate when dental considerations make an open smile less than fully comfortable for the subject. Whether due to current dental work, orthodontic appliances, or personal preference about showing teeth, the closed-mouth smile provides a genuinely warm alternative to the open smile that serves professional photography very effectively in the right hands and with the right genuine emotional engagement behind it.
The Expression of Competence: Serious Doesn't Mean Unfriendly
The serious professional expression, when it is done well, communicates something specific and positive that is quite different from the cold or unfriendly expression that some photographers inadvertently produce when directing subjects toward seriousness.
The professional seriousness that works in headshots is the expression of someone who is fully present, fully focused, and fully committed to the professional work they do. It is the expression of genuine professional engagement, not of displeasure, not of social distance, but of a person who takes their work seriously and who brings full professional attention to what they do. This expression is warm in the specific sense of genuine human presence even when it does not include a smile.
The warmth in a serious professional expression lives in the eyes rather than in the mouth. Eyes that are genuinely engaged, genuinely attentive, and genuinely present communicate warmth and human accessibility even when the expression of the mouth is composed and serious. The quality that many people describe as "kind eyes" is exactly this: the genuine attentiveness and genuine positive regard that communicate through the eyes even in the absence of a smile.
The body language of the serious professional expression matters as much as the facial expression. A composed and serious expression accompanied by open, relaxed, and engaged body language communicates very differently from the same expression with closed, contracted body language. The former communicates professional authority with warmth; the latter communicates defensiveness or discomfort. A photographer who directs a serious expression without attending to body language may produce photographs that read as unfriendly when the subject intended professional gravitas.
The distinction between a serious expression and an unfriendly one in professional photography is often a matter of subtle eye quality. Eyes that carry a slight warmth, a sense of potential smile, of genuine interest in the viewer, even in a composed expression, retain the approachability that prevents serious professional expressions from reading as cold. Eyes that are completely flat or that carry a slight quality of challenge read as specifically unfriendly regardless of the overall expression. This subtle eye quality is one of the things that distinguishes excellent portrait photographers from technically competent ones.
For professionals who are genuinely more comfortable with serious or composed expressions than with warm smiles, the investment in a session that produces the strongest possible version of the serious professional expression, with excellent eye quality and excellent body language, is completely worthwhile. A genuinely excellent composed professional portrait can be more effective than a somewhat forced smile, and it serves the specific professional identity of professionals whose authentic presentation is more serious and composed than warm and expressive.
Reviewing Your Photos for Expression Quality
Evaluating your photographs specifically for expression quality, and knowing what to look for, is one of the most important parts of the post-session process.
Look at each photograph first at a glance, noting your immediate emotional response. The photographs that produce an immediate positive response before you have consciously analyzed anything are typically the ones with the most genuine and most effective expression. The photographs that require you to talk yourself into seeing as good, that look technically fine but do not produce an immediate positive response, typically have expression issues that are registered quickly and accurately even when they are difficult to articulate specifically.
Then look specifically at the eyes in each photograph. Ask: are the eyes alive? Is there a genuine quality of presence and engagement? Is there warmth visible in the eye area, even in the more serious expressions? Is the eye quality genuinely connected to the viewer rather than slightly averted or slightly glazed? The photographs with the best eye quality are typically the ones to prioritize regardless of other factors.
Look specifically for the Duchenne markers in any photographs with smiling expressions: the raised cheeks, the crinkling at the outer corners of the eyes, the lifted quality of the lower eyelid. When these markers are present, the smile is genuine. When they are absent and only the mouth is raised, the smile is performed, and the photograph will communicate the performed quality to professional viewers who look at it, even if they cannot explicitly identify why the smile looks slightly off.
Getting external perspectives on your expression quality specifically, not just on which photographs look best but specifically on which ones have the most genuine expression, provides the viewer-perspective information that is most relevant for how the photographs will actually be received. The people around you are more experienced at reading your face as it appears to them than you are at reading your own face, and their assessment of expression genuineness is typically more accurate than your own.
The photographs you ultimately choose as your primary professional headshots should be ones where you feel comfortable seeing your own expression repeatedly: where you do not wince slightly or have a small negative reaction each time you see the image. The expression in your professional headshots will be seen by many people many times, and the photograph you are at peace with seeing frequently is typically the one that captures something genuinely true about your professional presence.
