The basis for a skin merchant resource would be a face and body skin set that can be used as a starting point to make new characters by adding details. Most resource kits include extras like lips, eyebrows, tattoos, make-up layers, eye colours etc. Some include different shades of base skins.

Poser 11 Pro, Windows 10

Auxiliary Apps: Blender 2.79, Vue Complete 2016, Genetica 4 Pro, Gliftex 11 Pro, CorelDraw Suite X6, Comic Life 2, Project Dogwaffle Howler 8, Stitch Witch