I love this piece. She's visually stunning yet appears strong. I love that you seemed to use the New 52 design with the original colors. I don't think I've eve seen the stars as outlines before; it's pretty interesting.
There are only a few things I'd change:
Widen her mid-section, she's a little too skinny.
Cover her 'cheeks' a little more. It may be just me but I like a little more coverage. I don't much care for the thong/wedgie look.
Last maybe blend the shadows and highlights a little better.
But that's just how I'd do it. Stick to what works for you.