Looks better than anything I have ever modeled, but if I were to take a stab at critic, I would say that if you are shooting for realistic look, there is something not quite right about the appearence of the neck and the tendons in it . . . . were it meets the top part near the jaw, they are way to pronounced, and perhaps to much of a "V" shape to them. . . .
"The Sage as an Astronomer: If you still see the stars as something above you, you lack the eye of knowledge." Friedrich Nietzsche