I wanted to have an Illithid for gaming and got me D'Khul.
To create a "fishy" look on his skin, I painted it in pale violet metallics, shaded blueish and highlighted towards silver, then applied matt varnish.
I was quite happy with the result and got a bit carried away when also doing the staff in metallics and the hood and hem with violet-green iridescent pigments. The photo is not so brilliant, one will have to imagine it shimmering under different light directions.
What do you think of the basic idea? Should illithids look like that or should they rather come with a dark-and-simple scheme?