I came across a tutorial that I thought was better than any other doll making eye tutorial I have ever seen. Check it out here: Link
Some of the best things in this tutorial are the amount of detail, what to avoid, and you can tell that there have been HOURS of experiementing that have gone into finding out how to make the perfect dolls eye
Check out Misty Moons blog, because she also has an even more in depth tutorial that uses UV cured resin. It includes what to watch out for, like colors bleeding / separating.