Holy Lord,
I'm at a loss for words. That's a pretty rare occurrence.
Your line technique is very much refined, and spot on in this piece.
The expression and pose are fantastic.
You've got a good use of thick and thin lines around her head and curves, the arms though could probably stand for a thicker outline, considering they're closer than her hips. (Especially her left ((our right))).
The background has amazing detail, I'm loving the texture. It evokes a lot of atmosphere. Then again, you've been pretty spot on for backgrounds for a long while.
I can barely fathom how much you've improved since your first piece, man. Slooow down, you're blowin my stuff out of the water. heh.
I can't wait to see more.