Really nice work, Bodge. I'm very impressed with the textrure of the shirt and jhat, the rubber look of the ear pieces, the stubble of beard (outstanding!), in general your skin tones. Couple minor points...looks like the eye lash line on the lower right eye is a bit heavier than the left and the eyebrows look a bit heavy to me. Also, the hair at the front of the left earpiece might need a bit more color...looks like some skin tone got on the hair.
The sculpting of the mouth doesn't do anyting for me (you've done a great job on the lips, tongue and teeth, however.)