Dave Bowman

Okay, it’s been a long time since I’ve done any human modeling, so I wanted to test myself with this project.
I’m trying to model Dave Bowman’s face, from 2001: A Space Odyssey. As I think it’s still far off from realism, I could use some critique.

My main reference:

The only thing I would change is the yellowish ‘ring’ around his lips. In the photo it looks like the angle of the light is causing it, in your model it seems as if you textured it that way. Other then that, it looks perfect!