This is a great image - no doubt; but it is still fun to sit on the couch and look for improvements.
Stomache and armour are particular well handled and I have no issues with the thick rubber like hair is great- speaks a lot of fantasy.
One area that stands out is the breasts, for some reason this is one area that 3d artists often get wrong despite the fact they spend so much time modeling them. The line below where they meet the body is really harsh and the shape is a little too gravity defining- like she is wearing an invisible under-wired bra. Be brave and be the first 3d artist to avoid \"silicon\" breasts and give her an A-cup.
The piller she is sitting on- just needs some texture detail- comes across as a little unfinished compared to rest of the polished image- then go out and sell it to Marvel- you have a real protagonist there.