Well, I went back more in the direction of simplification. This isn't a whole lot different than a shader dadt posted a while back, although the particular colours etc came from my own judgment. I'm very happy with this on a materials level, which is what I was after here. The styling itself isn't very good (still not my forte), and the render could be improved in other ways (hair should have a bit lower density, and the render settings should definitely have more pixel samples—this is set at 6; and IDL, which is in the 50 range, should also be higher quality).
Still, pretty happy with this.
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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