9 Hours?!
Wow, I would have expected a lot longer to see a piece like this take shape. I love the detail, particularly how you've captured her eyes in such a fashion that they follow you around the room - a difficult achievement, even for a photographer, but you've been able to duplicate it yourself.
I would say that the mouth looks slightly off-line, as if you've moved it all to the left of the picture just a little. You've captured her features well and the whole impression that the image gives is rather pleasing all told.
Perhaps if you did something like this again, I'd go for more of a "bust" image, where you see perhaps down to her shoulder-tops or even a whole torso-shot. Yes, the face has been well worked, but surely, you're capable of more, what with how you've played the lighting and other such areas into the piece. Maybe it's just me, but a better background might also be more desirable.
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