In this picture taken on March 30, 2016, Chinese model Xu Naiyu (C) walks past paramilitary guards during a break at China Fashion Week in Beijing. Tall and stereotypically thin, Chinese fashion model Xu Naiyu exudes a happy optimism but is matter-of-factly realistic about the fickleness of her chosen career, and how conventions of beauty change around the world. / AFP PHOTO / FRED DUFOUR / TO GO WITH AFP STORY BY BECKY DAVIS