This free eye material and model can be used to create infinite eye variations, and can be scaled from "toon" to realistic. You can even make them glow using a slider.
I've included a "toon," "realisitc" and "glow" versions in this project. The sliders and inputs are all labeled and it should be pretty easy to use.
CC0 - so do anything you want with them. As long as it's legal.
Sure! It's CCO so it can be used for anything. (as long as its legal!) but a word warning I did notice when I tried to use it for animation A duplicated eye uses the same coordinates for the material as the first and I had to create a second material from the first.
But I just downloaded it and I think it should work fine.
thank you