A very good review in the New York Times

[eggplant107]

"Order of the Phoenix" also introduces Evanna Lynch, a pale, wide-eyed
15-year-old nonprofessional from Ireland who, having read the book,
decided that no one else could play Luna Lovegood, the weirdest witch
at Hogwarts. It seems Ms. Lynch was right. She's spellbinding.

For more see:

http://movies2.nytimes.com/2007/07/10/movies/10harr.html?em&ex=1184299200&en=c5f5c1fa58f4a5dc&ei=5087%0A