Your coloring is really good, just right for that comic book style. Her face is drawn well and fits the character, you seem to have a good sense of muscle and how it rests under the skin, but you have some problems with the anatomy.
[link] I did a redraw of how I would have done it. Make of it what you will, but it's just more input. Her waist is impossibly thin, and to do a pose like that would take a lot of concentration of her part. With the way her waist is, it makes her look pretty flimsy like she's fall over any second, apart from being, like I said, too impossibly thin.
I understand women can be perfectly voluptuous, which is I see what you were going for with her thighs and butt. However the fat distribution throughout her body (of which there is very little.) makes her thick thighs look very unnatural. When making a curvy woman, make sure the fat distribution is realistic.
Her breasts are gravity defying. With the redraw I did, you see that with her being upside down, her breasts should sag downwards a little. Also, while this is popular to do with women in comics, the way her suit fits over her breasts like that just is incorrect. Clothing, even when it's skin tight, doesn't cup over each boob individually like that. [link] Fabric rests and stretches over the breasts, rather than curving tightly around it.
Her arms are just a bit too short as well, and her feet are tiny.
I know it's popular to stylize comic book women to the point where they're anatomically not just impossible but ridiculous, but still. I think it's perfectly possible to draw a sexy, attractive woman but still keeping her body proportioned and possible.
There are a lot of great things about this picture. The composition is really fantastic, your color scheme is nice, and I really like how the clouds came out and how the lightening look.
Her pose is very dynamic, but has anatomical flaws. I redrew it if you're interested, although mine isn't 100% either. [link] Her torso is too long and her pose suggests that her spine would be curving, but her torso looks very straight. Also if you think about how her hips and legs would connect to her body you'll just see further that her torso is too elongated. As for the legs themselves though, I like how you did them. Just the way they connect to the body doesn't make sense.
There is no force of gravity acting on her breasts. Even if she's supposed to be a little flat chested, we should still see her breasts having some sort of gravity pulled down on them, if that makes sense. Her shirt also defies gravity.
With her face, you're getting there, it was good that you attempted to draw it at such an angle and it's a good attempt. Keep practicing face angles and you'll be fine. I'd say keep an eye on how the jaw line looks when drawn at angles like this.
You should practice and study the way clothing folds as well. Her skirt looks a bit awkward. It looks as if you added lines to it to try to give the illusion of folds, but you didn't pull it off to well. The folds around her waist look strange especially. Almost like it was molded rather than being a free flowing fabric, just very stiff.
The lighting I think is pretty good, but I think you could've taken advantage of the lightening to make the lighting even more striking and vivid. If that makes sense.