Sorry for the delayed response @Kendarr - I’m pretty sure that’s the one I was trying to get to work here.
@ArtPomelo In keeping with the (possibly foolish) oath I made to do everything by hand or procedurally, the textures are all hand-painted (including the brushes I used to paint them with). The benefit of that, aside from the control, is that it avoids the problem of all the layers being baked into the epidermal colour map as with photos. Consequently it should potentially allow for more realism I think.
There’s a screenshot of the nodes here which use bump, specular, surface colour and subdermal (scattered) texture maps.