I think both versions of the adult fox have serious issues with the position of their head. At first I thought, oh it's looking over its left shoulder. Then I reconsidered the pose and thought, right shoulder? Then I just decided the head was on backwards.

The head doesn't make much sense, it looks like a chili pepper, to put it humorously. I don't understand the shape of the head, or why you changed his hair to red. Also the entire left arm looks as though it was originally drawn to be facing us (as if it were his right arm, which would be correct since Link, up until the Wii iterations has been left handed.). Were link facing away the shield would be closer to the viewer then the left forearm. I see a lot more, but I've got to run...

There's some strangeness already in the way the punch is flowing. Sure, you can lean in when you punch, but unless you meant for it to look as though he was just leaning forward into his punch with this weird foot jitter following, then you're doing it wrong. I'm not sure if you intend for your character to have some training in combat or not but you can always look up a video of someone executing punches in a particular way (in this case, boxing/muay thai). If you jump to 8:00 he starts doing some combos. There are a ton of different fighting styles and tons of demonstrative videos on youtube. Peruse, pick something you like, try it out yourself, then turn it into crazy tiny pixels.

If he is a brawler try looking for street fighting, otherwise you have a ton of martial arts/trained fighting styles to choose from.

A little bit of an update, some improvements to the chest to make him have less boobage and his weapons now sport bone blades, among other minor changes.