Face Decals
It's been tried...by a few in this hobby, me included.
I use eye decals that were done by Mike Beal and those really add a lot.
To go beyond eyes, I've tried faces from websites, etc and they really end up looking very unnatural as they don't blend in with the skin paint, etc. There's probably a better "middle ground" out there to accomplish what you are seeking but as of now I haven't seen too much in terms of face decals beyond eyes.
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