I paint eyes on my streamers, on bead heads, cones and hour glass eyes.
I use the drills that are 1.5mm, 2.0mm and 2.5mm (the back end).
First I put put on f.ex white color by stamping it on the fly, let it dry for some time and stamp black color for pupil with smaller drill.
then I let it dry over night and paint it with Sally Hansen Hard As Nails three times.

I use this to fish for trout, I have always thought that this is more for me than the trout, I like them this way and enjoy painting the eyes.
Because I like them better this way, I'm more confident fishing them and get more fish...I like to think.