I've been using the "Carnall Technique" lol, by painting in the base color of the eyes before anything else. All thanks to Darren Carnall for showing me his method! Beginning with the whites, then adding eye liner shading, followed by painting in the base color for the roundness of the iris. Then painting on the skin and hair. Once all that is done, go back to finishing the eye color and adding in the pupil position.
Found this works well, as when the base color for the eyes is set early, it helps bring the character through before painting everything else, so it compliments the direction of painting in skin tone and hair features through the process. This method also works really well when painting sculpts with very squinty eyes ..as I find that when I have painted in very squinty eyes after doing skin first, at times I've touched areas around the eye socket with the eye color and had to touch up ..so no problem this way.
One thing that has eluded me is finding a source for Future Floor Polish here in Australia, or a similar product ..but I understand this stuff is great for giving the glassy look, then adding over a couple layers of regular gloss (testors, tamiya etc).
These are pics of Darren's technique, his pics show the process quite well. I took some pics of my own but hard to focus on getting good shots of eyes without sunlight distorting how they really look (with my camera anyway lol).
OK, heres a pic I've tried to capture of using Darrens way.
Hope this helps as well