Is the woman who asked the question sinful for buying a picture of one of the rulers at the request of the principal, given that the principal hung it in her office, and knowing that the woman who asked the question is no longer in the same school and cannot remove the picture?

The majority of jurists are of the opinion that it is forbidden to hang full-headed images, citing prophetic traditions such as "Angels do not enter a house in which there is a dog or an image," and other traditions that prohibit images in homes. Al-Shirbini Al-Shafi'i and Al-Buhuti Al-Hanbali detailed the ruling on hanging images, mentioning that cutting off the head of an image removes the dislike (karaha). Al-Nawawi, Ibn Hajar, and Al-Shawkani preferred the view of the majority, and many contemporary scholars, such as Sheikh Ibn Baz, Al-Qaradawi, and Ibn Al-Uthaymeen, issued fatwas prohibiting the hanging of images out of fear of veneration and exaggeration.

Therefore, you must try to persuade the principal to remove the image. If she does not comply, then repentance from the sin is sufficient, and Allah does not burden a soul beyond its capacity. Scholars have stated that whoever repents from a sin, their repentance is accepted, and the persistence of the trace of the sin does not harm them.