Ok ummm nords are paler bretons have a slight tan and imperials are hispanic looking
I assume you mean hispanic in the "Old World" sense...?
I recall when I was in the military in Southeast Asia, after a little time, and with pointers from a friend, an American Chinese from San Francisco, I was able to determine the nationality of many Asians. That skill has wained over the years, however, but it can be done. Sometimes the differences are subtle. But when those subtlies are known, the result is easy to observe, in most cases.