A free mod for Witcher 3, by Ellise.
Common Eyes is a mod that provides high-quality textures for the common eye colors used throughout the game. The project was created by an independent developer, and there is no official agreement or endorsement by Jagex or their partners. The mod is compatible with both versions of the game.
There are different textures for each of the main characters, as well as some secondary characters. The textures are designed to be used as a basis for creating your own eyes, and can be used to customize other parts of your character's face.
The developer of this mod has not been able to find the time to make comparison pics for all the different textures, so the screenshots shown in this description are the few that he has been able to create.