I was inspired to make the lil ones you see here after watching the anime "Princess Jellyfish" . From left to right they are
Princess Ma-rang of the Toxic Sea where she gets her glow even though she lives in a kingdom closer to the surface of the aquatic wasteland.
Prince Black Bell is form the deep sea kingdom of the Moira Trench leaving his body cold as ice and the jellys of his tribe use there bio-luminescence to tell one another apart.
and last but not least Princess Marmalade of fruity falls a tropical kingdom close to the surface in the coral coves.