Bottlenose Dolphin

Bottlenose to be specific! Wouldn't be hard to edit the current shark skin to make him into a dolphin. Change the colors to a blueish gray and a creamy white underbelly. I would suggest however that the current tapered design isn't exactly... Tapered in a sense. Perhaps something more similar to this? https://e621.net/post/show/768843/2015-absurd_res-air_bubble-ambient_fish-anatomical 
Understandably it's a weird design but smooth it out and give it a point and you've got a really hot taper.