Why Mona Lisa does not have eyebrows?

Look!
Why Mona Lisa does not have eyebrows?
Fashion in Mona Lisa's time was having a wide forehead. In order to achieve a fashionably high forehead, women might shave off eyebrows.

仔細瞧
蒙娜麗莎的臉上沒有眉毛，那個時候女性流行的美是擁有寬闊的額頭，當時的女人大多會把眉毛剃光，讓自己的額頭變大。