Then there's the problem with the Asiatic people ~ there are at least two different kinds, plus every "mix" possible. You have to be a dentist to tell the differences though.
Probably a better way to differentiate one group from the other is to check out their "y chromosomes". Europeans have three broad areas. Asians have Ghengis Khan (and a couple of other guys). I haven't seen anything about the Africans, but you just gotta' believe their working on something along that line, leastwise wherever it was King Shaka went back in the good old days, you could count on him checking it out.