(A2) + (H, +M, +S): She must cover the entire body except for the face (and hands, according to the majority and one report in the Ḥanbali madh-hab).
(A): She must cover the entire body including the face and hands. (H2): She must cover the entire body except for the face, hands, and feet.
Many of the later scholars of the four madh-habs deemed it obligatory to cover the face and hands as well, not because they are ‘awrah in themselves, but to block the means to evil and because of the spread of corruption in their times.
Keep in mind that the scholars disagreed over the permissibility of looking at the face and hands by foreign men. This is a separate discussion. The fact that it is haram for men to look at the face and hands does not necessarily mean that it is wâjib for women to cover them.
All madh-habs agreed that it is forbidden for a man to look at the ‘awrah of a non-maḥram woman without a valid reason (such as medical care, including nursing and helping people with disabilities, etc.).
They also all agreed that it would be impermissible to look at her face lustfully. If there is no lust or fear of fitnah (temptation, misguidance), they disagreed about the permissibility of looking at her face without a valid reason. (Valid reasons include the confirmation of identity in business transactions, for testimony, and by the authorities.)
(A) + (+S): It is not permissible.

(a) + (+H, +M, +S2): It is permissible. Al-Mardâwi al-Ḥanbali said in al-Inṣâf, “This is the only opinion that suits the people, particularly with their neighbors and family members.”