It looks great in my opinion. The hair is a bit confusing. It's a bit light against the dark robotic backround. But hey, that's just my opinion. As some of the others said, the mouth is a bit confusing, raising it a bit I feel it will add more effect.
Adding to all the others, the depth and shading looks sweet. I'd give it an 8/10. But it has great potential to reach 10/10. Well done mate.
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Oh sorry, Only saw the front page. Looks great in these new pictures. Keep it up man. 9/10 :P