Is this a composite of women from that region? It looks very clear for being made up from a group of images.
I always thought that it would be interesting to see how people change over geography. I'd assume that you would see a gentle change of this feature and that feature over geography.
Whilst it's an interesting image, I find it hard to believe the "average South African" woman is white.
Maybe it's sampling bias, as in that's the average South African woman whose picture was identifiable on the web? I'd like to know more how this was done.