Being too flashy as well as showing too much flesh would never grant you access on my style icon list (Sorry!).
What i think girls should look up is the Royal Style, looking classy and embracing their own beauty. Every girl should see herself as a princess :) or Her Royal Highness (HRH)! (but ofcourse not too seriously).. just taking care to express yourself in a classy way that shows how graceful and beautiful you are. Or at least avoiding vulgar (nouveau riche) styles :s
One of the ugly outcomes of the nouveau riche style nowadays >>> the classy and classic Chanel bag is spotted on every other girl you see... Fake that is... i believe chanel should only be worn by those who understand the style of chanel and look like a chanel girl (im sure you all know what i mean :) ).
So, who are the modern royals?
One example: the royal style of Olivia Palermo...
Ofcourse, she is always well groomed ..shiny hair and classy makup..fancy textiles :)
Another approach to the classy look is looking natural and embracing your femininity.. like Charlotte Casiraghi.. the granddaughter of Grace Kelly has got the best genes in the world and she is beautiful beyond all reason!
So enhancing natural beauty by focusing on eyes, eyebrows, lips, skin and hair color would make you look waaaay more classy than having tons of makeup on your face.
Finally, you can express yourself in a classy way.. like Margherita Missoni ... not so much the outfits, but by the way she carries herself.. well, its hard to explain this one but have a look:
Classy fairly-new brands: Stella Mccartney + Victoria Beckham ;)
hope u get inspired!