Is it obligatory to delete previously published pictures of animate beings, given the ignorance of their impermissibility, or is it sufficient to stop publishing them in the future? And is it impermissible to share a post by someone who has placed a picture of an animate being?

More important than answering the question is to draw attention to the harm of being overly strict with oneself and asking too many questions, as the Prophet, peace and blessings be upon him, forbade that, due to the hardship and restrictiveness it places on the Muslim. The issue of photography with a camera is a matter of disagreement among scholars, especially digital images. It is sufficient for the questioner to avoid posting these images herself, and to remove what she can easily delete from what she has posted previously, without exaggeration or difficulty. Do not exceed that in action or in questioning.