its not bad. i think the back shouldnt be so big and it should start at the end of the shoulder and curve in up til that first strand of hair. (wonders if that made any sense).. i agree with you, the art is clean. maybe fill in that shadow you drew. ^^ really like the hair you did.
her upper body, the way she's bent, could use some work (the line of her back should curve more "inwards" if you get what I mean ^_^), but the overall picture looks very nice, like Deetris said, the simplicity in this is awesome ^_^ and I like the hair! ^_^
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