How can an adulteress repent when the one who committed adultery with her possesses her pictures and refuses to delete them? And what should she do?

Repentance from zina (fornication/adultery) requires the same conditions as repentance from all other sins between a servant and his Lord. If these conditions are met, the repentance is valid. The presence of photographs does not affect its validity, as scholars have stated that when someone repents from a sin, their repentance is accepted, and the lingering effect of the sin does not harm them. They gave the example of someone who spread an innovation and then repented from it. One must be cautious of forbidden mixing [of sexes] or khalwa (private seclusion with a person of the opposite sex who is not a mahram), which could lead to falling into the abomination again.