I added some redness in the eye corners that's visible if you rotate the eyeballs far enough to on side or the other.  I think that'd be more realistic than having it visible all the time.

By the way, in case anyone's interested, here's the male character I was talking about.  His official name is Victor.  I designed him to look at home in a Superman suit, but I also intended for him to have the versatility to play other roles as well.  Comments welcome.