I little ironic, I think. A little bit of trivia, the myth of the unicorn (a horse with a long horn) originated from a now extinct species of rhino. A four-legged animal was a giant horn on its head. Horses and rhinos actually have a lot in common.
Now this is truly interesting ;] not only rhino and a horse, but also a human - I can't help but to wonder how would it look if he was just a mix of human and rhino, just like now but with a rhino lower half. Just like an unstoppable hulking tank of a beast. Nontheless, this is awesome, I like the compostion and overall design of the thing.