What is the ruling on a woman uncovering her face, hands, and feet during prayer?

The jurists have agreed upon the obligation for a woman to cover her entire body during prayer, except for her face, palms, and feet. It is permissible to uncover the face, unless a non-mahram man is present. As for the palms, the majority of jurists hold that it is permissible to uncover them during prayer, while the Hanbalis are of the opinion that they are 'awrah and must be covered. As for the feet, the majority view that it is obligatory to cover them during prayer, whereas the Hanafis and Ibn Taymiyyah believe that covering them is not obligatory. Although the preponderant opinion is to cover the feet and palms, uncovering them or part of them does not invalidate the prayer, even if done intentionally.