Before you start AA'ing I would work on adding some more specular highlights (assuming the character is slimy, and not a matte, clay-like consistency). As wet things are usually reflective, it would also be a good idea to include some reflected color; if it is going to be outdoors, blue is a good color to reflect. You have a lot of pillow-shading and bad lighting going on, especially on the edges of the blob and on the teeth. I agree, more slimey bits around the mouth would be good for the character; you could check out the Flans in the FF games for some inspiration, perhaps. Keep at it!