Wow it's brilliant. Really great pic! I swear it's wonderful you have talent, that's for sure.
Nitpicks:
1. Her left eye is kind of differently shaped and larger compared to the right one.
2. The spotlight effect should be minimal, it spoils you work. It should be just a soft fading off toward the corners, not so... harsh.
Besides these itsy nitpicks, it's just too good I love her looking back and the way you've drawn her clothes.
But either way, a free hand drawing? I'm amazed. Keep drawing! ~Lava
~ Pretending in words was too tentative, too vulnerable, too embarrassing to let anyone know. - Ian McEwan in Atonement
Cheat your landlord if you can and must, but do not try to shortchange the Muse. It cannot be done. You can’t fake quality any more than you can fake a good meal. — William S. Burroughs