You have Diffuse as an input into Blinn. That might be confusing the renderer as it make no sense whatsoever to qualify the color of specular reflection according to the diffuse reflection. Total nonsense. I'm not saying that is causing it, but that sure is shader gibberish.

I sort of recall bugs in the Velvet node. And there are surely problems with translucence which hasn't made anything correctly since Poser 5. (All forms of global illumination, IDL or IBL, confuse it.) I see you have Velvet running the translucence - a recipe for disaster, IMO.

Velvet is a lighting effect, and so is translucence. Asking the system to resolve them both in the same bit of logic is - troubling.

As if that is not enough, I notice the Velvet also runs into a Diffuse claiming to be the diffuse color. Since Velvet is a lighting effect that itself combines diffuse and specular, this path, too, is possibly cause for gibberish.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)