Here's another pencil sketch, possibly for the Ship of Fools image (below):
Pencil sketch of a head, 2009, pencil on paper, 11" x 8.5". I didn't adjust the contrast on this one (see Ship of Fools image below), this is the way the image came off of my scanner.
For a long time, I've mostly been avoiding using pencils in my work, as the contrast is not so crisp, & they get muddy easily. However, it strikes me that those are qualities (lack of contrast, muddiness) that can actually be useful sometimes. Pencil work is a lot more spontaneous than ink work, in most cases.