I'm looking at the head and face and thinking; WTF?
I understand that it's meant to be cartoonish/anime style, but (good) anime has a pretty strong sense of anatomy and the head of your person is quite a bit off.
Also; the background is kind of a mess. Find a theme and go with it, right now it's just ugly looking swirls. I see gothic-loliita style clothes, so maybe hot pink and black broken hearts or something in the background. I'd lose the aura around her as well.
Not bad, all in all, just trying to show you areas where you could improve your picture from my perspective. =]
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