The Eel Woman.

" William Alland envisioned the creature as a "sad, beautiful monster" and the sculpture of it was much like that of an aquatic development of a human. Alland said, "It would still frighten you, but because how human it was, not the other way around". Originally, the creature's design was meant to incorporate a sleek, feminine ell-like figure, which did not have as many bumps and gills as the final version."

This Tiny amount of information led me to create The Eel woman. the concept version of what the Gill man was supposed to be like. Very sleek body frame that would allow it to move around. She can swim backwards, normal fish don't do that. She has subtle lady-like features. such as bright eyes, lips, breasts formed under the skin, wide hips, And two thighs that end up as two tails. And plenty of fins, Just like any Eel. OH! and as a bonus, I made it look like she's a deep sea creature. There is no light at the bottom of the ocean. Just blackness.