Yes, in the one that leads. A genuine smile is the fastest way to read as warm and easy to be around, and she is making that call in roughly half a second. The rest of the set can carry a calmer face. The lead image should not.

What a smile is doing in that half second

She is not judging your teeth. She is guessing at your temperament.

A face at rest is ambiguous, and ambiguity gets read cautiously by somebody scrolling alone at eleven at night. A face that is plainly enjoying itself removes the ambiguity: this is a man who is pleasant to sit next to. That guess is most of what the first image is for.

The brooding shot is not wrong in itself. It is wrong as the opener, because it asks her to give you the benefit of the doubt before she has any reason to.

Real versus held

There are two different things men call smiling, and only one of them works.

A real one moves your eyes. The corners crease, the whole face joins in, and it looks like it arrived rather than like it was assembled. A held one stops at the mouth. The eyes stay flat, the jaw looks tight, and the whole thing reads as somebody being photographed.

She can tell the difference instantly, without being able to explain it, and a held smile is worse than no smile at all. A held smile says you are uncomfortable being looked at. A calm neutral face says nothing, which is a better place to start from.

So the real rule is not smile. It is do not fake one.

Where a serious shot belongs

You do not want six grinning images either. That has its own problem: it starts to look like a man performing being fun.

One or two frames where you are not smiling give the set range, and range is what makes it read as a person rather than a product. Somewhere down the order, put a photograph of you mid-conversation, or concentrating on something. A frame where you are plainly not arranging your face does real work.

Put them second, third or fourth. Never first.

Teeth, eyes, and what the camera exaggerates

A few mechanical things behave predictably enough to plan for.

A closed-mouth smile can read as smug on some faces and warm on others, which is why the answer is to look at your own images rather than to follow a rule. A big open laugh usually photographs well and is almost impossible to fake convincingly. Squinting slightly, the way people do when something is genuinely funny, reads as confident rather than eager. Wide-open eyes plus a grin tips the other way, into looking desperate to please.

The camera also flattens everything by about a step. Whatever felt like a small smile in the moment will look like a straight face on the screen. That is worth knowing before you decide you look ridiculous.

How to get a real one out of yourself

Nobody smiles properly on command, so stop trying to.

The usual methods all work by removing the command. Get whoever is holding the phone to talk to you and take the shot mid-answer. Walk toward them and let them shoot on the second or third pass, when the self-consciousness has worn off. Have them say something that actually makes you laugh, then keep shooting for another four seconds, because the honest frames are usually just after the laugh rather than during it.

Take far more frames than you think you need. Out of sixty casual ones you will find two you would use, and out of six posed ones you will find none.

When your face is not the actual problem

Plenty of men asking this question do not have a smiling problem.

What they have is a folder with nothing usable in it. Every image is a group shot, a wedding from three years ago, or something taken at arm's length in a dim room, and no expression advice fixes a set like that. The lighting decided the outcome before the face ever mattered.

If you have a friend with a phone and forty minutes of daylight, that is the cheap answer, and outdoors in the hour before sunset does most of the work for you. The aim is not a flattering mask. It is an image that looks like you, on a decent day, in the middle of enjoying something.