Hi Dave,
It looks good. Only problems that I see are that the lips kind of look like rolled clay right now. They don't have the proper shape. He also doesn't have any eye lids. There is also a small bump in the side view as the eye blends with the rest of the head. Smooth that out a bit. Also the transition from the nose to the cheeks look a bit strange. Smooth this out a bit as well.
The other thing is just a small problem with your edge loops. The loop around the mouth, that defines the laugh lines, should start at the top of the Alae. Make an extreme face in the mirror, and you'll see that it starts there, instead of the bottom of the nose like you have now.
Looks good. Nice job.
Imagination is more important than knowledge.