Underwater Creature Research

For this project we are to make an underwater creature. So i did some initial research so i can make sure that you can relate the creature to a real life creature (which would make it look more realistic)
The gills are pretty simple addition just a few slits. The eyes are all pretty basic, there very round and plain looking.
In terms of the mouth it has very large lips that are turned down.
Scales can come in a few different forms.
I have also looked into a couple shells as i am maybe thinking of making a shell creature.

bloooob bllooooob bloooooooob