So you want Caucasians or Whites? If you want white-skinned models then why not just say so! If you say "Caucasian" you could end up with all those horrible brown people from India and Africa!
I'm really tired of ppl using the word "Caucasian" incorrectly ....... just say "white" for chrissakes if that's what you mean!
"Caucasian" is a purported race that includes most of the natives of Europe, West Asia, North Africa, and extending into the Indian subcontinent. This category was first proposed by the German scientist Johann Friedrich Blumenbach, who coined the term in his treatise "On the Natural Varieties of Mankind" in 1775. His studies based the classification of the Caucasian race on primarily on skull features, which Blumenbach claimed were optimized by the inhabitants of Georgia in the Caucasus mountains.