Firstly Welcome to CA.
I think the piece lacks contrast and I would suggest pushing your value range a bit more. Everything is in mid-tones, from the background to the character, and that really flattens the image.
When i say push your value range more, I basically mean, make your brights brighter and your dark's darker. As for the background, i would suggest pushing it way back, by lightening it up, popping the character of the page and giving it more weight.
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