There are some stray pixels around his waste... Very much like on your animated AVA... just tidy them up and then it's wicked...
Most noticeable is above the knee on the punching frames 1 & 2... Very hard to spot, I thought I had dust on my screen...LOL
Side note.
Watch your Ava's Feet, that sort of thing... And you see again about half way up your sprite there are pixels left and right that need rubbing out.