Praise be to Allaah.
Shaykh Ibn Baaz (may Allaah hav mercy on him) said:
It should not be
uncovered, rather his entire body should be covered, unless he is a muhrim
(in ihraam for Hajj or ‘Umrah), in which case his face and head should be
uncovered, because the Prophet (peace and blessings of Allaah be upon
him) said concerning a muhrim who died in ‘Arafah: “Do not cover his head,
for he will be raised on the Day of Resurrection reciting the Talbiyah.”
Agreed upon. According to a version narrated by Muslim: “Do not cover his
head or his face, for he will be raised on the Day of Resurrection reciting
the Talbiyah.”
And he also said:
It is not permissible to uncover the face of the deceased,
whether a man or a woman, once he or she has been placed in the lahd (niche
in the grave), rather it must be covered with the shroud, unless the
deceased was in ihraam, in which case neither the head nor the face should
be covered. But if the deceased is a woman than her face should be covered
with the shroud even if she was in ihraam, because it is ‘awrah.
Majallat al-Buhooth al-Islamiyyah
(68/44).