Of course, the color is the file you created in Photoshop.
One thing I found makes a dramatic difference is to add a very subtle bump map to the eye. Now, I know that the eye doesn't seem to have bumps of any kind, but bumps help to break the highlights of the eye, and give the impression of a tear lingering on the surface of the eye. I personaly like it very much, and with a bit of time, you can play with the bump map to make it look like some tear collected at the border of the eye lid and so forth. For this example, I added a generic noise, so forgive me for being a bit lazy.
And this is the result of 5 minutes work. As I said, this isn't a perfect recipe, and I am sure people with much more experience than me are having a good laugh at my attempt. But I certainly hope I gave some interesting ideas. Good luck!