are there specific examples you have? Like "I want to look like Bettie Page" or "I love J-LO's style"?
I think you have to look at who you admire the most (looks/body wise) and then go from there. It's hard to say without really knowing you but I know that I was more "girly" and "retro" when I was smaller - def. more like pin-up/ rockabilly style
