I don't mind people asking about my techniques at all.
I've done some write ups on both
painting male faces and on
battle damage.
Those write ups are all about general principles, though, so they don't have as much on the specific colors I used. So:
Magnus' face was painted first in P3 Midlund Flesh, then shaded with Skorne Red and Traitor Green (both mixed with Midlund flesh, except in the darkest areas).
The face was highlighted using Rynn Flesh. The red around the eyes included a little bit of Sanguine Base, and the grey I used for the 5 o'clock shadow was Ironhull Gray.
Those are all P3 colors, but the principle is the same with any line of paints.