I understand and I agree with you. The Jews, however, did not mix much with non-Semites, so chances are that they would still retain Semitic features. Of course, soemone will bring us Queen Sheeba. And the fact is there are albino Africans. Everything is possible.
If Mary looked anything unusual it probably would have been mentioned. I don't think she stood out in the crowd.
Again, all I am saying, is that te Middle East is probably full of actresses whose "archtype" is more likely to have been that of Mary's. To seek out an unrelated race, beuatiful nonetheless, is puzzling.
As for Gibson's Passion, his portrayal was decidedly 19th century Roman Catholic rendition with noted extra-biblical and extra-canonical imagery.
The Holy Land is famous for being a crossroads of the world. But since you mention "Semites," there are other Semites in the regions besides the Jews. We also have Philistines, and Hittites, and Greeks in the area. The "Arabs," are not really a nationality but related tribes which married with the Syrians and others when they conquered the Fertile Crescent. Maybe their appearance is a fairer representation of first century features than the modern Israelis who very greatly in appearance. Then we have the institution of marriage. Royal harums can produce widely different offspring. Selim "the sot" the Sultan at the time of the Battle of Lepanto was blond-haired and blue-eyed. Solomon's children who numbered in the hundreds, probably varied greatly in appearance.