and here's the gloss map for the face (using GGX reflectivity): Almost all of the detail in the face comes from a combination of the base normalmap and a detail normalmap. the face has a constant reflective value (0.028) for the entire area.
http://graphics.ucsd.edu/~henrik/papers/skin-analysis/skin-analysis.pdf page 9. top right corner... There is an image of a face with colour coded/numbered regions. on the right is a graph showing the range of gloss and reflectance values measured for those regions. where "m" = glossiness (linear). the value of 0.028 is…