I think you could tidy up the AA, especially on the face, and the several-color dithering on the ears looks a little out of place imo, since everything else is two or at most three color cell style shading. Id say nix it, or repeat it elsewhere, just for the sake of balance, since the ears aren't important/large enough on their own. The joke isnt particularly funny to me, but this is clearly for a different audience.