I have to agree with FrostPumpkin about the colors, or at least the contrast. I can barely see the shading you have on this piece, so it would really benefit from deepening of the shadows. Most of the colors you've used, it seems, went into AAing this piece. That's up to you, of course, but my opinion is that such a small piece doesn't need AA. Still, it's a cute picture and I can tell you have a real handle on pixeling. Just up those shadows.
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