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It reminds me of those desert people from star wars (The ones that enjoy shooting rifles and get massacred by Anakin when he finds his mother ... To which she dies the second after he does :|)
Cool. Hard to tell if there's a dominant light source, but you have a cool 'shine' going on the metal. Good thinking with a mechanical robot-esque character, if he can't display emotions then he won't need multiple facesets. Brilliant!
I agree with Venetia about the top of the head's shading. It almost looks lumpy now. Your first one you had the idea of the shape much better in that it's round. Right now it looks like there's several indentures. The best part about this I find to be the silver/gray area around the neck. Looks good. This thing is coming out pretty wicked aweseome so far.