Hi Barry,
A tip...
Look in the mirror....
Paint what you see.
Eh?
Most people's error is to make the white's of the eyes far too big, and the pupil etc far too small - a tiny black spec in a sea of white.
The pupil and eye colour is not actually round for most people, it tends to flattened top and bottom by the eyelids.
The best I used to be able to manage was a short white line with a slightly shorter black line painted over the top of it - with just a smidge of the original white showing at each end of the line. All you're trying to do is suggest what is there so that the viewer's mind fills in the blanks.
Most of your figures look like they are peering, or squinting into the sunlight, which would mean that their eyes would only appear as horizontal lines - go and squint in the mirror and see what happens! :)
Up until a year or so ago I'd have painted up an example and done a piccie, but I seemed to have acquired 'tremors' that would occasional make it tricky to paint a 1:1 scale eye!
Regards,
-Rob
ps Forgot to say! :) Nice work so far on the figures - nice shading effects.