If you're installing it manually, just go into your Data folder, press Ctrl + F and search for all files with "malehead" and "femalehead" and remove them, the game will automatically revert to default faces the next time you launch Skyrim
I noticed a lot of people in the comments not being happy with the neck seam because the face textures don't mesh well with most body textures.
This little mod should help with that: https://www.nexusmods.com/skyrim/mods/91993?tab=description.
I used it to replace the SOS body textures and that damnable neck seam has completely vanished.
*Edit* Unfortunately the author did not place the dds files in the required folder structure so you have to create them yourself. The body textures go in Textures\Actors\character\male and the genital texture goes in Textures\Actors\character\SOS\Smurf Average (or whatever SOS addon you are using).
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This little mod should help with that: https://www.nexusmods.com/skyrim/mods/91993?tab=description.
I used it to replace the SOS body textures and that damnable neck seam has completely vanished.
*Edit* Unfortunately the author did not place the dds files in the required folder structure so you have to create them yourself. The body textures go in Textures\Actors\character\male and the genital texture goes in Textures\Actors\character\SOS\Smurf Average (or whatever SOS addon you are using).