Alright, there are a few things about their headshapes that could be done better: For one, Judy's cheeks aren't that visible from a sideview. Well they are, but it shows rather in the form of the entire skull instead of the actual cheeks. Example of what I mean:Look at the one on the right. See how the entire back of the head is just one connected shape?Another issue is that you use circles as a base for their headshapes. That works remarkably well on human heads, less so on animal heads, because they are shaped differently. try using a "gumdrop" shape, as Byron called it in his tutorial. A circle will lead to some awkward shapes on the back of Judy's head, it will feel too short. Also note from that ref pic that her nose doesn't actually break out of the shape of the head too much.Another thing that might be weird to point out here is to keep gesture in mind,. Even when all you draw is their heads, their stance will still affect the way the head connects to the torso for example.Otherwise it is awesome, I like their expressions and the joke really sells through the sequence.