Thanks to all of you for your feedback. It was interesting to read your opinions and knowlageable suggestions. I was interested to read about the sclera being a very light shade of the persons skin, and that the eyelashes are too sharp. Excellent stuff. A couple of you have mentioned that I should move the eyes away from a direct camera gaze, but what if the person is looking at me? I take your point about a smile but this will end up to be a dark image, you know, melancholic.

I've a couple of questions:

How could I create tears, the kind of tears that you get when you're just 'filling up'? You know, not in floods but just starting to get emotional. I've noticed that there are 'streaks' of highlights from the water on the lower eyelid. What would you do?

Finally, I've used an IBL to light this with a spot for the highlights, how should I proceed if I wanted a different shape highlight, i.e. a window? Is this the specular? Would I create a specular map? 

So many questions!

Thanks for all you're feedback, it's very reassuring when experts lend a hand.