Mermaid Colour Layout (Patreon)

Here you can see the Mermaid model in engine, complete with genetic colours appearing in the proper places. "Hair colour" affects the end of the tail, and the dorsal and side fins, while "Trim colour" affects the start of the tail and the face and ear scales.
Mermaids have longer ears than Lamia, and their breast size maximum is also a little bit larger.