I make faces when I draw, especially when I’m drawing a character behaving emotionally. I act. I generate the feelings that I’m trying to reproduce on paper. It’s not big and dramatic but it is obvious enough that I consciously have to keep myself from doing it when I’m drawing in public places.
One of the great revelations of my childhood was the discovery that other people didn’t have stories and adventures and voices and monsters and big bright worlds bouncing around in their heads. Poor other people.