I'm not going to say it's boring, but let me tell you why...
*I've seen it before
*If you're going to do half of the face, make it symmetrical at least. You have one eye, the nose and the mouth.
*Falls flat...nothing interesting really..
Aside from this, I'd have to say the tonalities are quite lovely as are the details in her hair.
However, at the end of the day, it is what it is. Just a portrait, there are billions of portraits out there and you have to think out of the box sometimes (if not always! -_-). Don't take photos with the mentality of 'just a portrait', you never want anything to be 'just' something. Go out and take photos and make them yours, something interesting, a new twist and something we haven't seen before.
I love the crispness and the tonalities; what were the settings you used? I'm not a fan of the asymmetry of the girl's face, though. Also, the expression on her face is a little blank; I don't feel a connection with her. That's probably just me being nitpicky though.
The eyes are the window to the soul and the most important. If you could get some light in there, either with a reflector or with PS and tone down the hot spots on the chin and nose you'd have something great. It's a good start, keep going!!!