Very nice job! I love the sculpt and the hair. And the HDR lighting looks really good. The DOF is on point.
The nitpick i can come up with:
The hair strands looks just a tiny bit too thick in the shoulder area.
Maybe reduce the strand shape abit or just the overall thickness.
(I only nitpick because I feel it’s so close to perfetion! So take it as a compliment :D)