That's what I was afraid of. VSS is so complex, and I'm not sure which settings are directly relevant to this issue. Most of the things that have a specified "Value" are either white or set to 1.0. I don't really think I changed any of that stuff, as it's well over my head. (Everything's hooked up to the Alt Diffuse.)

I've tried some renders that ignore all that and just have Diffuse set to .75 and Specular set to .25, and it looks pretty good (albeit paler)...  but the bump mapping seems to be considerably less noticeable.

But I better stop here, as this is getting pretty far afield from this thread.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3