Description below is copied from original SE mod.

Tintmask serve two purposes:
1. They are used when you create your character (Warpaints, Skincolor, …).
2. They are used when you (re-)generate Facegendata in the Creationkit.

If you don't do 2. then you will only see the changes of this mod and others like it on your own character. But you can use the CreationKit to use them for NPCs too.

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SKSE is required for this mod, without it mytextures will be downscaledto 512x512 and then be upscaled again.

You also need a SKSE.ini. Either create one at

<YourSkyrimInstallationFolder>\Data\SKSE\SKSE.ini:

It should contain:

[General]
ClearInvalidRegistrations=1

[Display]
iTintTextureResolution=2048

Or:
simply download mine from the optional files and install it with your favorite mod manager.