To use RealSkinShader for Miki, I modifyed the script as follows.

Before modify the script, I do recommend to backup "RealSkinShader.py".
Using Text Editor, Search the line containning
if material.Name() in ["SkinBody","SkinTorso", ... ,"ForeSkin"];
in RealSkinShader.py. (In my case it's line584.) And add followings after "ForeSkin".
,"Body","Head"
That's all.

if this dosn't work, replace the line as:
if material.Name() in ["Body","Head","EyeSocket"];
This case the script is for Miki only.