Excellent composition, lighting and posing from the model. I particularly applaud your decision to oil her skin. It gives her a high level of definition against the matte background, and really makes the image "pop."
I wish she wasn't waring the skirt. I feel like the model has a very striking form and her face holds such intensity that the skirt just cuts that off becuase of how dark it is and that it gos all the way to the flor.