That is some very clean artowkr right there! I can tell you've paid a LOT of attention to making the final result crisp and clean, you've done a very good job. The pose overall feels a little bit flat, like I can't tell if her knees are bent and she's sitting down, partly because of the shading on her legs partly because of the pure white background. The shadow behind her helps, but otherwise I'd say be careful of thigns like that. Her face and expression are very well done though, keep it up, thanks for sharing!