I'm pretty happy with my shaders (although there's always room for improvement). I just found myself short of realistic underlying textures because most vendors have specular (and often, reflections) right in the texture.

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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