I am trying to create a mod in order to use some NPC exclusive face textures for the player character. In particular, I want to use the face texture used by Magister Siwan. I'm having a hard time finding the tutorial area (where she is located) in the data editor. Does anyone know where these assets are located?

My plan upon finding them was to make a copy of the face texture and rename it in the same format as the default human face 1, then put it in place of human face 1 in the character creation assets, then do the same for the portraits.

Would this allow me to achieve my desired result? I am unfamiliar with modding.