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i'm not sure what you need there isn't too much to the pic. but if anything the back might benefit from more of a curved shape to it and that exposed breast.... i think you need to make a decision regarding the upper curve. it should curve out or inward. also keep line quality more in mind. like the shoulder that is fuarthest away. you gave it a very thick like. makes it look very bold and very up front. things that are further away should have a thinner and finer line then whats in the foreground.

lastly the face look pretty good. the eyes might be a smidgen far apart. tho it is true that when the eyes are slightly farther apart then normal it is very attractive.