I haven't seen this movie and I'm not familiar with the actress, but I'm half American Indian (The rest is Irish, Scottish, and German) and I've had people tell me I look Jewish and even Russian. Ironically, only members of my own tribe tend to recognise me as an Indian based on my own appearance, and even then only some of them noticed it right away. So I would suggest half-whatever really say much about one's appearance.
On a more important note, I think I'll avoid this one. While I could probably let some of the other theological issues slide the idea of St. Mary "with attitude" is a little much for me.
Societies were a lot more ethnically and culturally distinct 2,000 years ago then today. Today it is absurd to speak of any pure race, except maybe for some isolated tribes, and even then it is a sretch.
But that doesn't mean we don't know what the Israelites looked like 2,000 years ago. Mary was born in a village in the heart of Israel not subject to too many ethnic upheavals. I seriously doubt there were many blond and blue-eyed memebrs of her community. If she looked anything out of the oridnary it would have been noticed. We therefore must assume that she looked like an oridnary Israeli girl in that time and place.
Mary was most certainly not a teenager with an attitude. Such distorition is an attempt to make Mary more "acceptable" to our current faddish mindset so that we can "relate" to her.