Fantastic shot! the only thing I notice is the black area to the right side of her head. kinda looks like she might have had headphones on but as only showing on the one side looks a little odd?
I really like the idea here, the pose is good and the focus and DOF are spot on!
Now you did catch that well. Positioning is perfect.
As for the black mark, I wonder what that is. It wasn't the back was as that is white and would have shown up on the other side of her head as well.
And it was good to meet you.