@alia645, You probably haven't seen Shin Hye's other photos. She has different expressions, ambiance to a photo (innocent, sexy, chic, etc.). I have compiled some of her photos. I have seen the models you referred to but they are professional models and I find them unapproachable (I even found one that had same expression- expressionless). Shin Hye is celebrity model that appears more approachable. If she wasn't a good model, big companies wouldn't ask her to represent them such as Visa, Millet, Chanel.