Her abdomen is twisted wrong for the angle that her upper body is twisted. I recommend that you practice drawing real people for a bit, it might help you hone your fine detailing a bit- a bit is all that you need. (Don't worry if you don't copy exactly either, I can't draw what I see for crap, but this practice did help me out a great deal. Now if only I could figure out the copyright laws; I don't want to post what isn't copywritten.)