Experimenting with some paint and marbles.The paint manages to stick, but it’s pretty easy to scratch off, so I have to paint carefully. I used a pin and scratched a pattern into the paint on a few. On some I painted over the scratched pattern in a different color while others I left uncovered.
Full spheres have this crazy glow effect with a camera flash, but they look less vibrant than the hemispheres irl. The left sphere has the pupil painted on the closer surface. It looks sharper, but lacks the following illusion that painting the pupil on the back surface has. Unfortunately the full sphere warps and magnifies the back surface and causes the pupil to distort and disappear as the pupil appears to move to the edge. I won’t be using them for this project, but I’ll keep them in mind if I need pupil-less eyes.