I had to hold CTRL and press G. Here's how you must do. Hold Ctrl then press G of your custom or original NPCs. If it were a gray face bug after editing, hold Ctrl then press G again in Creation Kit.
It is as follows Textures & Meshes: Actors/Character/Facegendata/ Facegeom (Meshes) & Facetint (Textures) Skyrim.ESM, *[Your Own Mod] and/or *[Your Own Mod].esp
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It is as follows
Textures & Meshes:
Actors/Character/Facegendata/
Facegeom (Meshes) & Facetint (Textures)
Skyrim.ESM, *[Your Own Mod] and/or *[Your Own Mod].esp
OPTIONAL:
Have Archive from CK to create BSA.