This is a little bit similar the first one of pulling out the tang. But the only difference is that pulling out the tang has 

a purpose of looking the coolest guy, and 

smiling in photos has a beauty purpose. 

And when I say smiling in photos, I mean smiling even if you are not that happy. 

Just because when you smile your face got a bonny look. If you don’t feel 

beautiful, just fuck it, accept yourself as you are and be happy about it. A smile in photos will not change the thing. At a certain moment you will be tired smiling. 

If we had a look at most of people’s photos, we will be like saying: "oh 

god, is it just me or people seem to be 

happy all the time ?"