你别绉眉那样会不漂亮
[nĭ bié zhòu méi nèi yàng huì bù piāo liàng]
Translated loosely to 'Don't frown—it will make you look less beautiful.' It contains advice given affectionately perhaps by someone close who doesn't want the addressed person losing charm due to negative expressions. Implies caring about someone appearance linked to facial features.