Gfycat Version 1 : https://gfycat.com/YoungWelltodoAmericantoad
Gfycat Version 2 (Minimal Texture Animation): https://gfycat.com/LikableJubilantJavalina
And finished. Working on this one was a learning experience. I'm now able to use proxy scripts to animate textures. Post-process was still used for this scene. I rendered it twice, one with several animated skin textures, one with less. Then I blended them for Version 1.
My take-away: SFM proxies are limited in themselves but they could allow me to include falling tears, running sweat and other details into future works. I'll certainly look into it.