Miria anon if you're in the thread; I sculpted her lips for you, i wasnt able to test it with her whole head setup (since modifying her follower head is more involved than I care to get into) but here's the difference with different eyes and a different skin texture than you have. But i did sculpt it using her face texture on the model for reference, so I suspect it should look better on your end.

nif in catbox, and a couple vids comparing old to new. when you import the nif disable anything that's not the head or mouth mesh
https://files.catbox.moe/2aob4e.nif
https://files.catbox.moe/ed2evs.mp4
https://files.catbox.moe/k0r7ff.mp4