Are you sure you want the kind of responses that most will be?
While I think there are some die-hard pageant people, the vast majority of people "out there" think it's just wierd. I find that it really sets up the girls for huge disappointments in life and reinforces to them the mistaken concept that your value is based on looks, body, the way you walk, the way you dress and the way you "perform" when people are watching. It's so opposite of what should be valued in a young woman.
My DD has always been tall, thin and strikingly beautiful (which she did not inherit from me or my husband just the way the genes combined) - when she was a child people would stop me in the street to tell me how gorgeous she was - she did some modeling but I found it to be so awful, so much waiting, so much artificial stuff (primping, smiling a certain way, etc.) that we stopped. She is now a teenager, about 5'10" and begs me to let her try modeling or pageants. Our answer is that when she's grown up and out on her own she can try it - but while we are in the process of raising her to be a contributing member of society, someone who loves God, she (and we) are not going to spend days and weeks, financial and other resources trying to out do other girls with hair, makeup, walks, kissing up to judges, etc.
Instead we make her keep her grades up, volunteer, and be involved in one school and one church activity. So she helps teach sunday school, she babysits for an autistic boy who adores her and will only go with her, and she does flagline at school. The goal is that her physical beauty is only a small part of her and does not in any way measure who she is, or establish any value - but that her value was established by Christ's life & sacrifice and that she can add much more to society by giving back and helping out.
Physical beauty is nice - but it really does fade as the years go by - even with plastic surgery!