I designed this creature to fit in the ancient cetacean family lineage (some kind of Pakicetid) sometime in the early Eocene epoch roughly 50 million years ago.
I based the anatomy on fossil remains from the time but the character design is heavily based on hippos and alligators - one for the family relation and the other for their similar niche in the ecosystem.
The character was done in blender, and the Cycles renders were edited in Gimp.
WIP1
WIP2