Is it permissible for a woman to uncover her head and some parts of her body to her fiancé, with whom offer and acceptance have taken place and Fatiha has been recited, and who claims he is her husband and that only public announcement is missing?

Dating between men and women online is not permissible due to the corrupting influences it entails. A woman's statement, "I marry myself off," is not valid, for a legally valid marriage can only occur with the woman's guardian (wali). The Messenger of Allah, peace and blessings be upon him, said: "Any woman who marries without the permission of her guardians, her marriage is invalid, invalid, invalid," and he also said: "A woman may not give another woman in marriage, nor may she marry herself off." Reciting Al-Fatiha for marriage has no basis and no relation to its validity. Based on this, it is not permissible for you to reveal any part of your body to this man or to be alone with him. You must cut off your relationship with him and repent to Allah. If he wishes to marry you, he should propose to your guardian, and you remain a stranger to him until the legal marriage contract is concluded.