It's really nice, excellent readability, but it looks to me like he's wearing a two piece spandex... or more like a 1-piece swimsuit and leggings...., that line at his hip bothers me. Also, why is he moving up and down purely vertically so much? Breath deeply for a moment, does your body move only up and down? No, it sorta bends and straightens.
I feel weird giving crit because I haven't even shown myself to be a decent pixelartist here yet, but just saying what I see.