Forgot to post this - decided to go for a less horsey face while retaining the ears etc. Remember that the adults are big enough to ride, e.g. elephant seal sized or bigger. I thought about trying to add harness etc. but life's too short so I've captioned it as a young hipp.
Am I wrong to feel really happy that I can legitimately call one of the nastier creatures on Ganymede, which is essentially a silicon based life form that behaves like a rock crusher with hypnotic powers, a "Black monolith"?