Is it permissible to lighten the eyebrows? Is it permissible to look at a woman's nakedness without touching it with a finger to know the body's composition before marriage? What is a woman's awrah (private parts) in relation to another woman, and is it from the navel to the knee?

As for lightening the eyebrows, there is no harm in it unless it involves deception towards a suitor, because it is not among the forbidden plucking (namṣ). It is disliked for a person to look at their own awrah (private parts) without need, but if there is a need for it, then there is no harm. The awrah of a Muslim woman in front of another Muslim woman is what is between the navel and the knee. As for a non-Muslim woman, it is obligatory for her to cover her entire body except for the face, hands, and what appears during work.