For me, the eyes lookes best if Diffusion put to 100, ambience on +/- 15, both with node from the picture. Try to experiment with the specularity, that can change the wole eyes.
 For the , I beleave it is the corona, I select the water material. This should give better results.

Also , this is not a rule, mor a guide I use for meself. there are better tutorials on this on the web, like this one:
http://www.geocities.com/matcreator/tutorial1.html

Good luck.