I'd say it's not bad at all!
But the dithering is a little to clean. It's meant to be fur, try a more randomized dithering, make the dark and light area blend in each other more progressively.
The grey lines in the "hair" of the animal is a little to well defined too, feels out of place. The animal looks really skiny, is it intended? If not, defined the ribcage a little less maybe.