You could either, make her look feminine and give her a manly pose, or make her look manly and giver her a feminine pose. That's a way to convey her strength.

the abs look ridiculous.  Just erase them and make him wearing a shirt. the right arm on the inside goes up to far. He has no shoulder joint!! Color would also help this piece. Right now it's just line art.

Ok, back to the original look. Sorry for straining. It's just kind of hard to keep it simple. Started working on a level design, but I'm not sure what to put. I was picturing an old creepy Victorian house. I tweaked the legs and started in on some more AA. The grandfather clock is hideous I know.

Try delaying the head or just breaking up the even action. Here is a small edit. I hope you don't mind. It looks pretty solid to me though. The only thing I would do different is try to incorporate a hop. He is after all a frog.

Lighting source could be more consistent. Especially his pecs. His hands are tiny and hard to read. It looks like he has tiny tree limb claws. The top of his head is too dark. Contrast is real high but I think it's because you have a black background which seeing the original you intend to keep, looks fine.