I really like the pose, and it certainly has a bit of atmosphere, the face hints at a cheeky grin (to me anyway) yet it's not in view.
I think the execution is slightly off, not far off, just slightly and I'm not sure where, the focus pehaps or the contrast between the light side of the face and the dark. Maybe even just the angle, something out of focus on the right (her left) just above the shoulder (perhaps it is the shoulder) seems to distract me.
I keep scrolling down to look again as I write this. There's so much right about it I still like it, I'm just not sure what niggles at me.