Wow! The pose is so incredibly graceful... and beutiful. And you have done an absolutely perfect job with the lighting--it is so soft yet full of great contrast to really showcase her great curves. Amazing work.
I'm curious about something (let's rephrase that: I'm dying of curiosity): Did you ask her to stand still in that pose (that would be indeed impressive, because of the pose)? or it was a photo with a very fast exposure (which would be really impressive as well, as you took it at the exact moment during the movement)?