Unofficial Skyrim Special Edition Patch

Eyes and skin tint modifications are obviously intended, as Dawnguard intentionally modified all vampires appearance when released.

Yes, it looks like all the NAM9-Facemorph for Sybille accidentally vanished in the process. The easy fix is to keep all USSEP modifications, copy back the facemorph data from skyrim.esm, and then regenerate the facegen mesh and texture files.

There is also a small possibility that it was intended (it's an assumption, as I never played as a vampire): when not feeding for long the player seems to gain various powerful combat abilities, sun vulnerabilities, and its appearance degenerates from day to day, until reaching some kind of 'total monster' generic appearance. Dawnguard designers may have just wanted to reflect the last stages of vampire transformation on Sybille...

I'm not sure I understand exactly what's being proposed as a fix here. I'm looking at USSEP in xEdit and as far as I can see, the only actual data change is the head type and head texture, and the only vampire specific thing there is the head texture.

Attached screenshots show the problem. All facemorph sliders for Sybille are deleted/values restored to default by Dawnguard. Laelette, as an example, was correctly ported...

Attached Files:

Sybille WRONG.png
Laelette OK.png

EDIT: Apparently it's only a real problem for OLDRIM.
When Dawnnguard was released its associated bsa archive carried the new facegen mesh with new vampire eyes and (sadly) wrong facegen. It overrode the base game one.
However, since Special Edition, while the record data is still corrupted, the facegen mesh was generated straight from the start with the new vampire eyes. Thus, the game engine loads the correct facegen mesh.
However, any mod editing Sybille face based on the DAWNGUARD record carries a defective facegen mesh. I think there's also a SKSE plugin displaying face morphs ingame straight from the plugins records instead of using the generated facegen meshes. The problem would of course be obvious there...

So just to be absolutely clear here, the NAM9 subrecord is all we need to fix? And then generate facegen, or no? Cause if we need facegen then this fix will only be good for PC and XB1 and we'd need to leave it out for PS4.

I checked and regenerated the facegen data in the CK with both USSEP fixes and restored NAM9 subrecords.
The generated nif and dds are both different from the vanilla ones. I mean they have different sizes and md5. I can't tell if there's a real visual difference. So, I'd say everything needs to be fixed. Fix attached below.

Attached Files:

FIX ISSUE 32806.7z

There is no apparent visual difference for the textures, but including the morph data changes the shape of the head mesh.

With the original vanilla face morphs, her head is a bit fatter than without those morphs, but it's definitely noticeable and probably correct, so Dawnguard botched this one for her.