The ruling on 'shaping/plucking' the eyebrows;

A woman is not permitted to remove the hair of her eyebrows by plucking nor to modify them by a thread, razor, scissors or anything else, since such an action is considered a form of a prohibited Nams (plucking the eyebrows).

The Prophet (Sallallahu Alaihi wa Sallam) cursed those women who does such an action, whether it be to herself or to others.
In Sahih books of al-Bukhari and Muslim 'Abdullah Ibn Masoud reported that: "Allah has cursed female tattoo makers - and those females who get tattooed, and those women who have their superfluous hair plucked from their faces and those who get that hair plucked, and those women who get their teeth filed (to make space between them) for beauty, and thus interfere in Allah's Creation".