Most people smile in photos because they want to look friendly and nice. A smile makes you seem more approachable, and people usually want to look good, especially if the photo is going to be shared online or kept in a family album. Smiling also makes the picture look happier and more pleasant, so it’s more enjoyable for others to see.

I think people smile in photos because they are usually taken during happy times, like birthdays, holidays, or other celebrations. Smiling shows that they are enjoying the moment and want to remember it as a good time. When people look back at these photos, the smiles help them remember the happiness they felt.

Another reason is that it’s kind of expected to smile in photos. In many cultures, people are told to say “cheese” and smile when someone takes a picture. Sometimes, people feel like they have to smile because everyone else is doing it, especially in group photos.