I use Tamiya enamel paints and Gaianotes enamel paints for eye painting.
Basically, I can paint with Tamiya enamel paints alone, but if I need to produce highly saturated colors, I use Gaianotes pure colors. Fluorescent colors are also used as needed.
Gaianotes....it comes in a container that is very difficult to use compared to Tamiya's. So it is better to replace it with something else, such as Mr. Color, which is easier to use.