What is the ruling on a wife going to a studio and having her picture taken with her head uncovered, without her husband's knowledge, given that she wears hijab, prays, fasts, and obeys her husband?

For a woman to photograph herself with her head uncovered, while her hair is considered awrah (private parts that must be covered) by the unanimous agreement of scholars, is forbidden. This act involves disobedience to Allah and opposition to her husband. The prohibition intensifies if the photographer is a non-mahram man. She must repent to Allah, destroy the picture, regret her action, and resolve never to return to such a deed.