You need to fix your transparency, the character is 1/2 see-through at the moment. You also need to fix your canvas size, it's much too large and the character is off center.
After that, I suggest using less saturated colors and perhaps working on your shading, though I can't really tell as-is.
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After that, I suggest using less saturated colors and perhaps working on your shading, though I can't really tell as-is.