Eyes are very important to a character. If u want to animate it, not for still. U should make the eyes become life.
eg. the highlight on the iris can be a real specular, not paint on it. May be u need to build the iris separately, cause it's hard to animate the eyes in ur model now.
Siegfried have mentioned the mouth b4. Yup, it's difficult to make different shapes of the mouth with texture. And texture mouth is hard to understand the emotion of the character in many angles.
Try ur best, try to make it life!
