As for the materials, there's nothing much here really. I feel like this is a matter of tampering with the numbers and rendering and fine tuning each parameter because things will be different for different textures. I must have rendered some 40 times today to get to this result.

Skin:

Eyes:

Eye surface / cornea (LaFemme's cover her entire eyes, for meshes that ony have a separate cornea you'd need to add highlights to the eye material too):

Tearline is a slight variation of the eye surface:

(Don't mind the node connections, these are for the Firefly root)

I haven't finished up the materials for inside the mouth and for the nails yet so I'm not showing those :P

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.