As you may or may not know, having a custom face texture replacer mod installed (any non-esp based texture replacer such as no more blocky faces, better females, etc) while the CK is running could possibly be preventing the facegendata from exporting properly for esp files, hence the grey face issue.

disable these mods and ctrl f4 your npcs. it does not fix the lips though, so...

after you have exported your ESP's face data, open them in photoshop


now locate the folder - Textures>Actors>Character>CharacterAssets>Tintmasks

and search for a ddsfile that matches your character.

i have a female nord so i selected femaleheadnord_lips.dds


when you open this in photoshop you will see that this is an alpha mask.

select all and copy.


go back to your face tint map, create a new layer and create a layer mask. paste the lip mask into the layer mask alpha channel.

color the layer to whatever color you want

flatten the file and re-save as dds (you may also need to do this for the targa as well


results:

http://i43.tinypic.com/16gu4i.jpg