In many ways I like what you did... but to be honest, I don't get the pose. She is looking up into the light, but Im not sure that in this particular situation having her looking toward the camera might not have felt more natural. She feels very much like she is leaning forward, but hands are cut off... just "to me" doesn't feel natural. Not sure this pose in this setting tells me much about her.
Technically I think its pretty well executed. Probably a little extra negative space if it were my shot.... but then again that would be my shot, not yours. I would strive to make the viewer wonder what she was looking at, or what she was thinking. Maybe a little more of the environment would help that. I love low and high key shots. I just want more information here...
Thanks for sharing though... looks like it was a good session.