When I look at this, the first thing that comes to mind is fluidity. This model was captured performing movements which she highly enjoyed, and it shows on her face.
I love the lighting, how it illuminates her from the left side of the photo. Great shadows. It really lends weight to this living moment.
Zero motion blur, whether this is from her being still at the time the photo was taken (highly unlikely) or, more likely, you have a great camera.
The overall feel of this, to me, is ecstasy and joy. I have a personal preference to models that are displayed in this fashion, but the look on her face, the moment you captured this particular frame, was magical.