Not everything's that great.
The one thing I can't get over are the 3D elements in your backgrounds. They look unfinished and just cheaty.
But as for the main illustration, the perspective is again, a bit off. Her left breast [from the viewers perspective, right] is on a higher elevation than her right breast, which from this perspective it shouldn't. But then again, she is being lifted up at an approximately high speed up through a transparent tunnel in space so that I guess that could have been intentional.
Other than that, it looks pretty good.
Her back appears slightly big for the rest of her build though.