I love the setting and the blue tones, a bit quirky, a very cool modelling shot. My only gripe would be the crop, cutting off the bottom half of her legs/feet. I think composition-wise, this would have been improved if she was lounging or crouching in the corner instead. Still an awesome shot though.
I feel that the subject would be much more striking and prominent if placed in the corner due to the fact that 4 lines converge at that point. Otherwise a very interesting composition.
I like the idea of this portrait, but your model looks really awkward with her head turned that way. It doesn't look natural. I like the blue editing of the background, and the natural vignetting on the sides.