I think without clothes, mannerisms, and accent it would be too hard to tell.
Here is a good link of some famous people's ancestry.
http://starmixedrace.blogspot.com/20...1_archive.html
..and of the photos I posted, this is their ancestry.
Chris Cornell
Ethnicity
Irish and Jewish English, French Canadian and German
Johnny Depp
Ethnicity:
Cherokee, Irish, German
Neil Gaiman
Ethnicity:
Jewish Russian and Polish