When I recently enabled Dawnguard on my existing vampire character, I was a bit dismayed at the graphical changes that were applied to all vampires - especially the player characters. It kinds of strains immersion when you're walking around town with a leathery face and glowing eyes and nobody seems to have the slightest clue that you may be a vampire. So, I started thinking about a making a mod that would change your appearance from "normal" to hideous based on the stage of vampirism that you're at.

After digging around a bit looking for possible ways of doing this, it's not looking too promising - but I'm far from an expert on the CK, so I figured I'd pick the brain of the collective hive mind here.

The basics would be like this:

• Stage One: Identical to the vanilla game with the same changes to face and eyes
  
• Stage Two: Same as stage one or perhaps further change to eye color
  
• Stage Three: Eyes change to the DG glowing eyes, face stays the same
  
• Stage Four: DG glowing eyes and vampire facial textures.

Now the eyes I don't think would be much of a problem since there is the Actor Script function SetEyeTexture that could switch them out as needed. The problem is there doesn't seem to be a similar function to swap textures for anything else, even though skin textures are defined through TextureSet and HeadPart just like the eye textures are.

The most likely way to do this is through SKSE, but the relevant command, SetNthHeadPart, is in, shall we say, development hell -- it's not consistent enough to be useful unless you're duplicating a face completely, and it's not well-documented.

SetEyeTexture() won't make eyes glow. You need to change the eye itself for that.