I am also noticing the texture of the eyes....is off. I think it is the pupil...it is not very suttle ( I spell it wrong) if you look at it as a close up. It looks like it is missing the translucency...I think.
Go to thegnomonworkshop.com There is a great eye tutorial you can download for free. But their server is always busy.
SimplyMaya specialises in Maya tutorials. We offer over 1,000 individual Maya training videos, ranging from basic Maya tutorials through to intermediate Maya tutorials. Our tutorials are created by instructors with industry experience and are designed to get you up and running in Maya quickly without making it seem like hard work.