I don't think this is an issue with your mod specifically, but when I change their hairstyles in SSEEdit, it looks like they've been hit with the makeup gun. It's not the dark-face bug, and I copied your custom facetint files into the proper MO2 Overwrite folder, so they should be the last thing applied.
edit: Might have fixed it. Solution: Clear all facetint layers in SSEEdit (except skin tone) Open CK -> Actors and use ctrl+F4 to export the bugged NPCs blank facetints Copy the files from Tragedian folder into Overwrite (textures/actors/facegen/facetint) Now it works, for some reason
Any mod that edits an NPC would need a patch regardless of whether it's appearance-only or just makes changes to their perks/spells, AI packages, etc. To my knowledge, there's no edits in my mod that would "break" another. If you mean compatibility with perk overhauls, several vanilla followers (especially from the Dragonborn DLC) already come loaded with tons of perks & some 3DNPCs are no different (i.e. Rumarin). I've tested Vokrii & Adamant in my games with no issues whatsoever since I don't edit the perks themselves, I just added them to the NPCs.
Sorry for the super late reply, but the hair is baked into the character mesh so I didn't include them in the mod. Are you using Face Discoloration Fix? Face Discoloration "Fix" is just a bandaid for load order issues. From the mod page "NPC appearance overhauls that use custom sculpts and custom textures are safe to use with this mod installed, but if you have a conflict in your load order that breaks those mods, this mod will not be able to restore the intended appearance. It will only fix the discoloration."
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edit: Might have fixed it.
Solution:
Clear all facetint layers in SSEEdit (except skin tone)
Open CK -> Actors and use ctrl+F4 to export the bugged NPCs blank facetints
Copy the files from Tragedian folder into Overwrite (textures/actors/facegen/facetint)
Now it works, for some reason
Thank you.