Deepwater Creature Concepts

Glass Eel - almost completely translucent with phosphorescent spots on the tail to draw in prey to strike with crystalline teeth.

Neon Cuttlefish - another translucent creature, this one only visible by the reflections off its hardened beaks, iris and maybe the edges of its blubbery tentacles and fins.

Fish man - this is honestly more of an illustration excuse to play with high contrasts and distortions from bubbles.

An attempt at a humanoid creature with multiple sets of eyes and a hardened external skull like a dunkleosteus.