The PhysicalSurface node serves as a middle ground between Firefly and Superfly. It performs adequately in Superfly when the texture nodes are arranged optimally. Nonetheless, the texture maps are not ideal, as Rhia has noted. The face texture map is not to my liking, but currently, it's the only option available. I plan to reconstruct the skin shader using Cycles and the Principled BSDF nodes to see if it yields any enhancements.