A neutral expression can look controlled and editorial. It can also look tense, distant, or flat when the eyes and mouth are not working together. A subtle smile often changes the photograph without changing the person.
The 2023 Portrait Study
Researchers Valuch, Pelowski, Peltoketo, Hakala, and Leder used a broad set of portrait images and created neutral and slightly smiling versions with AI-based image processing. Across two experiments, participants completed a rapid keep-or-delete task and a slower aesthetic-rating task.
Subtly smiling portraits were kept more often and received higher aesthetic ratings. The depicted people were also generally rated as more attractive in the smiling versions. The pattern appeared across both fast and deliberate judgments.
What Makes the Finding Useful
The smile manipulation was deliberately small. The result does not say that the widest possible grin wins every portrait. It suggests that a modest positive expression can improve the aesthetic quality of an image and the impression of the person in it.
The study also separated the beauty of the photograph from the attractiveness of the depicted person. Participants responded to both, but not as if they were exactly the same judgment. A portrait can be aesthetically stronger because the expression makes the whole frame feel more alive.
Important Limitations
- The expressions were digitally manipulated rather than naturally produced during a live photo session.
- Preferences varied between participants and image types.
- A professional role, passport photo, fashion image, or serious editorial portrait may call for a different expression.
- A smile cannot compensate for poor focus, extreme camera distance, or bad lighting.
How to Create a Natural Micro-Smile
- Relax the jaw instead of pressing the teeth together.
- Exhale before the shutter so the mouth and brow release tension.
- Think of a person or moment that produces a small real reaction.
- Raise the corners of the mouth slightly; do not stretch them sideways.
- Take a short burst as the expression arrives and fades.
- Compare the neutral, micro-smile, and broader-smile frames at profile-photo size.
Match the Expression to the Context
For dating and social profiles, warmth and approachability are often useful. For a professional headshot, a controlled smile can communicate confidence without becoming casual. For a dramatic creative portrait, neutral intensity may be the better choice.
The right question is not "Should everyone smile?" It is "Which expression makes this image communicate what I need it to communicate?"
Test Expression, Not Identity
Take several photos without changing the camera, light, or pose. Alter only the expression. That turns the shoot into a clean comparison and prevents you from confusing better lighting with a better smile.
FaceScore can help you compare how presentation choices change the image, but the output should remain feedback about the photograph rather than a judgment of personal worth.