You've got a great render there. IMHO, caustics are unnecessary in the eyes. That would take away the details of the iris which you want to emphasize (At least I would). Jeremy Birns has written several books on rendering and here is his page on caustics: Caustics: 3dRender.com As great as Caustics are in a render, I feel it isn't needed in renders of the human eye. Other opinions and thoughts welcome.

Boni

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"Be Hero to Yourself" -- Peter Tork