Something I just noticed:
The bonestructure under her left eye is not quite correct, The bump would follow the eyesocket. It's a lot lower in the reference than I expected but still not as exaggerated as in your piece.
While trying to figure out how the eye socket sits I also noticed some perspective issues with her eye. So I rotated it a bit clockwise to better match the perspective and changed the shape to fit the new perspective (well, I tried at least, but I think it works a bit better).
Also changed the chin a tiny bit, the angle isn't properly in perspective I think but it's very minor.
Hope it helps.