Finally found one good example (license is CC-0)
https://www.wesaturate.com/photo/Kn8c2lg4
This is the original:
And these are my edits:
Found it hard to reproduce, there are so many parameters that change so much.
Modifying the width of the gaussian blur in the different layers (or lowpass instances in darktable) changes the smoothness of the contrast, can give a glassy look of the face or a rough and hard texture.
Anyway, my XMP files:
Kn8c2lg4_01.arw.xmp (12.2 KB) Kn8c2lg4.arw.xmp (11.4 KB)