Truth is, not everyone of us smile to show what we feel. I keep a neutral facial expression all the time, but we all know what I feel. Even if I would be happy, ye'd never know. So I guess all I can say, 's all a mystery. A smile is something that'll always be mysterious. Let's say, my OC, Faceless, he wears a mask cause he doesn't have an actual face, hence the name. As for my winged demi-human fox OC, Paradox, he wears a mask to hide how depressed he is, not to mention he's mute.