When it comes to EZSkin: there's a possibility to create its own plugin, just in case.

Not sure that Poser13 will immediately get a preview for Cycles, but I've heard that it's on the way.

And as hborre wrote: I'm using Vic4 through Sasha-16 and a PrincipledBSDF-based material settings for the skin: it looks great, considering the age of Vic4.

𝒫𝒽𝓎𝓁

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👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
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