Great picture,
That looks really sharp. I love the subtle lips. And you've avoided the "cold stare" that is so prominent in 3D character models. Just really nice.
I would like to see more, perhaps a profile. I do agree with a previous post that the brow should probably be lowered, but then again, faces come in all sorts of shapes, that's to say, if you saw someone in real life with a brow like that you'd be like, "he's got a funny brow...." It's more aethstetic than anything.
~Dan