Noo… Only looks complex Watch the link I’ve pasted (Bartek Skorupa at Blender Conference) and you see how simple it is Only difference between what he shows and what I’ve made watching him is that he had only one rendered layer in his presentation and i decided to render eyes, teeth and skin on separate layers (so thing that Bartek did copied x3 and added together). I don’t know i didt it good but it works for me… Oh… and i also rendered AO pass and multiplied it on all at the end Of course i changed some values in multiply in some places. And as u can see i used RGB Curve for teeth to tweak them a bit also Hue and Saturation for Eyes Diffuse and RGB Curve for Skin AO pass.
P.S. Thank you and good luck too you too