I like that the color scheme is simple and easy on the eyes. The pouty, slightly parted lips gives her the seductive look. Her eyes are very pretty as well!

However, I think that she could be adorned in more jewelry and more elaborated make-up... since she's after all the madame of the best brothel in town. She looks like the girl working at the brothel rather than running it. A little bit of flamboyance wouldn't hurt.

The fingers of the hand on her hip seems rather odd. Just like claws. But then again, I'm being nitpicky. It's a critique, after all.

Overall, I think you did a great job. I like the fact that she's a little pudgy - different from the typical tweedy-looking madames usually depicted in the media.