Nice and natural stances, simple and smart scenery.
4, Because knuckles cracking is way too badass. Unfortunately she doesn't show any super. power.
1 is super fresh too, same remark about the superpower. Might be better with an enemy at the end of the spear.
5 is neat, again. This time she's flying, so using a superpower, and you can play a lot with the cityscape. I would either shrink the character or change the format so she isn't constrained by the frame.
Cheers.