Is it permissible for a woman to add her mahrams on Instagram if she fears they might not lower their gaze, or if she follows accounts that display pictures of women, such as henna designs? And is she sinful for following henna designs or channels that show parts of a woman's body?

If a woman follows pictures of women on Instagram, it is not permissible for her to add any man, even if he is a mahram, because this may lead to men seeing her pictures. She would then be sinful for assisting in sin, in accordance with His, the Almighty's, saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression." This ruling includes not adding anyone known to view pictures of women, and also not adding anyone not known to do so, as a means of preventing evil. As for following henna patterns and channels that display pictures of women, there is no harm in that, while observing the Sharia guidelines for a woman looking at another woman.