What is the"cleanest" way to make roughness, specular and sss maps for my character?

mangosteins

What textures maps or workflow would I use to create the cleanest roughness, specular and sss maps for my character? 

DrunkMonkeyProductions

You'd need a modeler program like Blender, Cinema4D, Zbrush, or Maya, to create a high resolution base figure(Multi-millions of polygons) with the details(pores, veins etc) as part of the model.

Then you'd need different lighting setups to generate the maps.

Then you'd need to put them in a photo editor, such as GIMP or photoshop, to adjust certain details to your liking.

Then you'd test the maps on a lower resolution figure, genesis 8 female, and make adjustments until the results in the render engine of choice are "acceptable".

 

An alternative would be to manually paint all the maps by hand in Affinity or Photoshop. 

 

There are various techniques, and you can find tutorials on all of them on youtube.

The result will be highly variable as will the work required to generate them.