Quote Originally Posted by Shota-Roe View Post
if they're cat's eyes they should still have a black pupil...
Not necessarily. I've seen many pictures where the use of a black pupil would be too dark and harsh. Simply using a darker color than the iris will give the illusion of depth and keep a very soft feel to the eyes. Color is an artistic decision and there is not really a right or wrong way to do it especially in this case.