What is the ruling of Islamic law on my continuing to be engaged to a girl who insists on going against my opinion regarding sharing her pictures with the niqab, changing the style of her niqab, and using kohl, despite my repeated advice to her and her family?

It is permissible for a niqabi woman to post her picture on social media if the picture is not exposed to the gaze of foreign men. However, if it is exposed to their gaze, it is more cautious to avoid it, especially if there is something in the eyes that attracts attention, such as adornment (exaggerated kohl intended for seduction). The fiancée should be informed about the fatwas related to this. The questioner is advised not to leave this girl if he sees righteousness and good character in her, for perfection is rare, and a wise person weighs good deeds against bad ones. But if she is not suitable for him, there is no blame upon him for leaving her.