The hippo part isn't implemented too well. But I see where you're going.
The legs, especially the toes, look deformed and distorted. Maybe you can work on that.
And just to save you the trouble:


I know that you are going for a cartoonish style/look, and it's great - let me tell you. But still, I think that if you work on the legs to make them look more real it would show more as a Hippopotomoose.
Great job, great consept, great idea, great style!
