A "cheap" way to approach a realistic eyeball

Since the day before i was experimenting with all the quite mighty and powerful mental ray's materials (subsurface and material x, mostly), on the next day i was challenged to reach the same result with a "cheaper" maya's materials. (it's still powerful, but in fact it take less than mia materials). So with the same geometry, polycounts, and textures, i tried to changed the materials into blinn (for the eye's iris) and phong/phong E (for outer kornea). It's losing some of the details compared to the "expensive one", but still consider as a qualify for me.

And here's it how it's render out (note: take 4-5 secs faster than the expensive one):

Cheers! ;-)