I think this looks a little more like african, maybe that's why you are having trouble finding it. I noticed because the hair is very curly and the collars the man is wearing look more like african art, also his nose is wide like african.

I found the image online and then did a reverse search of the image and found 230 different results you can see in tineye.com here

And yes, they all describe the picture as "african man". I don't seem to find the ying yang image you are talking about, though.

Hey and btw, good job with the portrait! very nice work