Trying some thumbnails for the illustration. I like the first one. The Superpower thing is bothering me, it's not my theme really. I wanted to depict her throwing fire or some sort of energy shot but I'm not sure... help me out!
Well he could radiate some sort of energy that would show that he is powerful? Or maybe the character's body could be partially made of energy or of some element.
This could be used in any martial art pose as then he'd not need to trow any fireballs or such