Well, like I told you in person last week; I used my caucasian recipy, simply darkened with scorched brown*.
So, a gradually lightening mix of Vomit Brown and white. Deep shading with a watered down Snakebite Leather and some colour added on the cheeks and or nose by adding the tiniest amount of red or pink into the mix.
For darker skin, I add Scorched Brown (or maybe chocolate brown or another brown) to the mix, and do my deep shading with a very watered down black paint (not ink, because of control). For Asian skin, I mix in Bubonic Brown instead of Scorched Brown.
Works wonders for me...

*
Disclaimer: I used the old GW paint names here as they're sort of hardwired into my system after several decades and I can't be bothered to look up how they are being called this week. Nowadays though, I use Vallejo equivalents almost exclusively...