It actually looks quite good! One thing I think you should do is get rid of a lot of black outlines and replace them with some thoughtful shading. In a lot of cases, replacing the black with a darker colored line would work. Outlines are great when you are first setting up a piece, but when you leave them in after you've done some coloring and shading, it has the possibility of making it look like a cartoon. If that's what you were going for, though, then leave them in. It's a great looking piece all in all.
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