This tutorial is for Paint Tool SAI only so if you are using a different program some things most likely will be different.
Hola! I'm new here on Weasyl and I haven't made anything right now so I'll just upload the most recent thing I made. This is a quick tutorial showing one of the ways I color Anime eyes and I was kind of in a rush to finish this so the background isn't fabulous, I'll be sure to make better looking tutorials later in the future.
Anywho, there are some extra images showing my brush settings and the steps that have a brush to them mean that I used that specific brush on that step.
The arrows indicate how I move that way you could get the same result if you wanted to.

If you need a eye line-art to practice on but don't want to make or find one you can use the line-art I quickly made for the tutorial. http://www.mediafire.com/download/7kuc101gb7w2q9r/simple_eye_line_art_by_clemicalthecreature-d91qqgk+%281%29.psd (It's .psd format by the way)