Eyes should be private map, but you can put both eyes on the same map. I don't find it a chore to use a mask if I want left eye and right eye to use different maps. What you don't want is both eyes identical.

If you want me to make procedural iris, the eye mapping should be aspect ratio 1:1, so if you're putting both eyes on the same map, make that map overall 2:1.

And make sure the pupil is dead center of the square for each eye.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)