Or, in my case, unfocused. When I get working on a book, or any other big illustration project, I often lose focus. I guess I get tired of seeing the same characters or working on the same paintings day after day. So, to break up the monotony, I'll take a little break and do really quick sketches or paintings. This is one of those paintings. Doing this kind of thing seems to refresh the creativity and makes real work bearable, keeps me focused. It works for me at least.