This is a detail from a larger sketch of a male model. His expression came out a bit angry-looking. Probably a result of my caricaturing his brow a little.
I'm still evaluating this one. I like some of the details: the ear and sideburns, and the crazy tuft of hair, but some more control of the values and gradations in the flesh tones would help a lot. The shadow under the chin particularly bugs me.