is he made out of goo still or is he like a stiff action figure? if it is goo then i would try to and shining and shading to it. also make it look more gooey by adding lil goo chunks fall/ drip off. make it more round and plump shape. drawing him in all 4-8 angles would also help but that might be hard and tbh, not worth it. but besides my question and a lil feedback i think you did a good job :)