Eevee Subsurface Scattering
I didn't realise this until recently but due to Eevee limitations, inputs to the subsurface radius socket never actually did anything as they are ignored. (Blender Docs on supported Nodes). All material shaders have been re-arranged to allow the add-on to control the subsurface radius socket default values directly.

Subsurface radius and falloff parameters should work fully now for both Eevee and Cycles.


Cycles Tuning
Something I have been meaning to do for a while now, is tune some of the material setups for Cycles. Because of recent developements in Blender 2.93 with the much better adaptive sampling and de-noising in the viewport means I have been able to make a start on this.

You can tell the add-on to use the Cycles materials in the Preferences or the Build Settings panel:


After build the materials with this settings to Cycles, it changes the hair, the eye occlusion and tearline shaders.

• The Hair shader now uses Cycles anisotropic highlighting based on the smart hair Flow maps.
• The Eye Occlusion shader is now made fully transparent. The Eye occlusion mesh is mainly there to emulate ray traced shadows and occlusion effects that Eevee cannot easily do. As such is it not needed for Cycles and made the eyes look too dark.
• The Tearline shader adds a mix shader with a Glossy BSDF to make the specular highlights of tearline show up more in Cycles.

Here's a ridiculously close up Cycles render of the eye to demonstrate:




Test Cycles Renders
And finally some Cycles test renders. These where all rendered with 128 samples, adaptive sampling and denoising turned on, at their defaults. They took 2-3 minutes each to render. (On the CPU as GPU Compute crashes my video card constantly...)







I usually don't go in for Cycles, but Blender 2.93 does a nice job of it.