- The chest reads like breasts because of 2 reasons - the dark part between the pecs and under looks more like under boob shadow than a man's rib structure, break this up. second reason is that the bit of shoulder from his left arm actually works to add to the chest - boob structure, try a strong contrasting color and maybe move the arm into a position that shows it's one continuos body part to avoid pieces of the arm extending the torso.

- The hair reads feminine but there are only a few things you can do about that since long hair at such scales will almost always read feminine. You can try to make it messy, a messy hair cut is more of man's style than a females, maybe get some spikes to fall over the front of his head.

- skinny calfs and feet are a female trait, sad to say. when it comes to these pixel scales you have to go with stereotypes, making the calfs and feet so small makes it looks like a woman's legs and feet

So character's hair looks unnatural, you should make it shorter I guess. Left arm and legs are mixing up with clothes too.
Not sure if it should or shouldn't have bigger/any feet. Left hand looks strange. Also darker colors could resemble more of ekhm, darker color but not the same, I guess for red it would be purple etc.

Character looks as character though and resembles red haired big boobed hunter so it's not that bad !

As for animation, right hand is stretching unnaturally, left is bouncing strangely and you can see pixels then it comes to legs. You have a long way but keep practicing and what is the most important have fun doing it !

I tried not to be harsh, please don't lynch me ! Also you can ignore my opinion as I am not a professional, just beginner like you