Thanks for the kind comments.
For African skin tones I use a number of different combinations as I don't want them all to be the same tone.
Besides the Foundry African skin triads, I use Captain Blood's GW Rhinox Hide method, VMC German Camo Black, Reaper Dark Skin Triad. The one for the Princess is Liquitex Soft Body Burnt Umber/Burnt Sienna/Raw Sienna.
I always use pictorial references when painting African skin as the highlights are different to Caucasian skin.