This week's doodle cracks me up. Do you see on the right that there is a part of the doodle that is blacked in? Apparently, I got lazy, but I like the way it looks.
If I am doodling a heavily blacked in area, I do it as I am doodling. I don't draw an outline doodle and then go back and color it in. I started a blacked in doodle and switched to an outline while doodling.
I like how it creates an illusion of depth.