I have never seen any attempts in 1/35 that realistically recreate eyes via detail painting. Even when beautifully done, I'm never convinced. Too much of a bug-eyed, cartoony-look. In my opinion, the most convincing approach is to darken the eye area with washes and let them be in the shadows. As most dioramas are depictions of daytime activities, that's really all you'd see anyway. Look at reference pictures. You see any white in those eyes? I don't think so!
I used to think I used the wash technique to create convincing eyes just because I was lazy, but when I started to think about it, at this scale (and certainly in smaller scales) it just doesn't look "human" when we attempt to paint eyes complete with the sclera, cornea, pupils, etc. I always think, "bo-yooiiing!" when I see such figures. Then you have Marty Feldman Syndrome to worry about, too...
I apologize in advance to those of you out there who painstakingly and lovingly paint all the details in each eye!
And if anyone has some pix of some truly realistic representations of eyes in 1/35, please post 'em!