I notice you're switching between two or three colours for your hair - this isn't a bad thing, but to use them like stripes without any form of coordination isn't a very good thing, so you might want to consider where the light would fall, where the highlights and the dark areas would be.
Also the sclera (the 'white' part of the eye) is NEVER fully white - the highlight you added to the left of the eye can get close to white, but there should be a difference in colour between the them.
Hope this helps ... (
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