WHat I mean with the eyes is try to have him looking dead on. If you recall the second to last cut scene from FF7, he kinda had a dead on quasi insane look in his eyes. If I could, here's what I'd do. First, reshape the eyes. They're too angeled, and clean up the mako glow. Here's some pics from AMVs for reference (click for larger images). As you can see, you are able to see more roundness in the eye ball itself, plus the mako glow is evenly distirbuted, all of which gives it a more dead of feel. The black lining of the eye kinda gives it the "can't sleep, I'm nuts" look. Those pics should also show what needs to be done with the eyebrows. So between the pic devion posted and these, you should be able to get a good idea of what to do.
-Karrde-