please consider this edit
1. avoid single pixels, generally. if a pixel doesn't belong to a cluster, it'll read as noise mostly and it's a prime candidate for creating banding around it.
there are situations where a single pixel is a great specular highlight however, like in the ear, but keep it to a minimum, I suggest
2. banding is a thing you should look out for. You didn't have a big problem with it in this image but all the little things you can fix make the end result that 5% better!
3. the biggest problem was that the legs felt too big and the upper body too small. This wasn't so much because of actual metric error (about which you have a lot of leeway in such a small sprite)but because of the malformed shoulders/foreshortened arm area, where you've made some dodgy choices, I think.