I'm happy to share another tutorial for the lovely people at texturing.xyz and their awesome V-Face packs. This is a quick and easy way of setting up your skin roughness and spec entirely in Arnold using the maps provided in the pack, with full control over regions in the shader.
I hope this is useful! You can now download all of the scene files for these videos at https://texturing.xyz/collections/vface-add-ons
Thanks to Jeremy and everyone at Texturing.XYZ for the opportunity to work with them :)