Nice depth of field, good focus and I particularly like that negative space to her right...it gives one the impression that she is still longing for whatever it is she left behind.
Very nicely done indeed. I do wish you the best of luck in the challenge.
The model, the B&W conversion and the composition are all stunning. My only gripe is the choice of the white border has given her a flat head - perhaps black would have been a better choice? Just nitpicking though . . .