pokeydots, I've found putting eyebrows on the texture map and then making transmaps for the two other brows gives them great depth. i've also found making the teeth slightly transparent tones down that too bright look they tend to have. You can also try making the material on the teeth a light, light yellow/gray. On the whole, your texture is looking good. IMHO you might want to tone the green eyeshadow down a bit, though.