When I work in my sketchbook I spend most of my time drawing faces.
I have books fill almost completely with quick character studies. I am not usually thinking of a specific character I just draw. This is also how I develop a character for a book, I just draw and draw until I start to see something that I like. Occasionally when I have time I take a drawing from a sketchbook and paint it. That is what the study above is. You never know, maybe he'll show up in a book someday.