I'm thinking I don't have as much of a gripe with her posture as I do with the fact that her legs are cut off in a somewhat awkward spot. Currently they're of the same value as the face, and are thus stealing the focus away and leading the eye downward. If lengthening the dress isn't an option, then perhaps darkening the legs might be a good starting point. If the spell she's casting acts as a light source, its proximity to her legs should place them in deeper shadow since the skirt is in the way.
(As an aside, have you considered extending the composition in order to show the entire figure?)
All told though, I think this looks lovely thus far.

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