in the actor form, in 'Template Data', in 'ActorBase' choose the model your npc will use and select 'Use Traits' (leave the other data alone unless you know what you are doing). create an entirely new npc from scratch, DO NOT DUPLICATE AN EXISTING NPC, This short tutorial is meant to help about that. The dark face bug is everywhere and it's a big problem when you are creating new npcs in a mod specifically made for the PS4.