I have come to the conclusion that point, spot, and infinite lights are no good for creating realistic renders. They don't "reflect" back into the scene from any shader in a realistic way. They don't have a "size" and are a compromise/workaround to get quick renders. I'll stick to area, mesh and background for lights from now on. Ok, here are a few renders of the lacrimal with various background lighting and one using Area lights.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740