That last one on the first wasn't too shabby (what map is that?), although the two red ones look really identical. Like others have said, I suggest using a variety of models if you want to get more experience. Other than that, you did an OK job with these :)
Doing research can also help to improve your poses.

Close observation to camera angles, the way character's face looks and posing can greatly improve your pictures if you're able to replicate them. The better the character's rigged the closer you get can get to copying the pose exactly.