If you think botos (Amazon River dolphins - Inia geoffrensis) are neat, I recommend checking out their cousins on the other side of the world, the Ganges River dolphin (Platanista gangetica).
This is a fun little personal project piece. It took me two tries to get the playful creepy cute vibe I was going for. I finished one piece completely, then decided I could do better. Lesson of the day is don't be afraid to redo something completely if you're not satisfied with the result!