Great pose, line art, and coloring! I love the shiny stuff in her outfit. She looks awesome. I can't get enough Faye Valentine. Are you sure you don't like pin-up art? You do it so well! Very cool that you put the blues sheet music in the background.
This is beautifully done but her left arm needs a lot of work, proportion-wise. It's too small and angeled oddly. Even as skinny as she is there is no way her elbow could reach all the way over to the other side of her rib cage and still be facing that direction. Everything else is beautiful except the arm I mentioned.