Presented below is a Firefly render of V4 with 4 lights on the stage, one of which is a Diffuse IDL.  The skin shader has been simplified and slightly modified to reflect how it should render.  The texture is from the same vendor you are using but for a different character, although the shaders are the same.  

Excuse the nudity.  This is to illustrate the new skin shader.  Below is the Material Room with a simplified arrangement of nodes.  

Study it closely.  It can be applied to other figures with modifications and tweaking.  Gone are those ColorRamp Nodes that faked Subsurface scatter, replaced with a true SSS node.  A Blinn node was added to control specularity and reflectivity, and a gamma node to Gamma Correct the Grayscale map generated from the Color Map.  

The Render settings below are just generic for guick rendering.