What is the ruling on using pictures of female relatives and neighbors for masturbation, and on changing their faces in pornographic videos, and what are the consequences of that?

The door of repentance is open, and whoever repents, Allah will accept his repentance, as stated in His Almighty words: "Your Lord has decreed upon Himself mercy: that any of you who does evil ignorantly and then repents after that and corrects himself - indeed, He is Forgiving and Merciful," and His words: "And whoever does a wrong or wrongs himself but then seeks forgiveness of Allah will find Allah Forgiving and Merciful," and His words: "Say, 'O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.'"

Repent to Allah with sincere repentance, follow up evil deeds with good ones, increase your seeking of forgiveness, and strive in righteous deeds. supplicate for those whose sanctity you violated and seek forgiveness for them, and do not tell anyone what happened. Plead to Allah to make them pleased with you on the Day of Judgment, for seeking their absolution for these sins may result in corruption.