Bump - what's your secret?
Oh, I am so sorry, please accept my excuse my good Sir. I totally forgot to answer, thanks for the reminder.
Here it is in all detail:
Basic skin tone is Vallejo Game Colour #42 "parasite brown", then highlighted with white.
I mix this very base colour "parasite brown" into black and put layers of it on a black coat of paint in increasing amounts until I feel satisfied with the result. You have to avoid getting to close to pure "parasite brown", instead keep enough black in the mixture to make it look flat brownish. That´s it. No big thing. Give it a try and another and after some practice you are there too.
Look here:
