Dr. McCoy portrait, part 3

Really happy with the way the hair is turning out, since McCoy's hair is an interesting mix of sleek and fluffy. I think I got it right.

So now comes the boring part: drawing in his shirt. I wonder if I can find a way to "cheat" and draw it in without actually shading the whole thing...I would skip the shirt completely, except that I really want to get that Star Trek insignia in there.