Thanks for the clarification, Odf. I have seen those subtle variations within the skin textures upon rendering. I agree there is room for improvement and simpler modifications. The PrincipleBsdf node is a better alternative, although there have been changes to its settings since P12, which disrupts some of the node connections. I recreated the node arrangement for P11's PhysicalSurface simply because the PrincipleBsdf node doesn't exist. I'll keep an eye on the Fresnel effect. Thanks again.