its a pretty tight crop, which i think is fine for a head/shoulder shot.
other than what tirediron suggested, i think maybe a tad more DOF so the hair on the right side of the frame is a little more in focus. other than that, its a nice shot overall.
I'm with the crowd. What makes this a good shot for me is the fact that it's sharp, has eye contact, is nicely processed and that your model has a good expression on her face. I often cringe slightly when I see "This is my first photo on the forum" ... but your shot gave me a nice surprise. Well done.
Like the others, this would benefit from a kicker or some kind of backlighting to create separation (and avoid the hair becoming part of the dark background). Eyes and expression are lovely.