Awesome lines. However, you must research AAing a little more, at the moment your AA (to the outer lines, mainly) gives a pillowing look to your pic, which really ruins it. I also think you could use your huge palette more effectively, some colours are hardly used, as if you've chosen your palette before you coloured. Try to unify your colours a little more! I think this has loads of potential, keep at it.
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He looks like he's gonna kill me D:
Very nice job! Hope you improve!