What is the ruling on a man's will that his face be uncovered from the hospital until he is placed in the grave, and is his son obligated to carry it out?

Uncovering the face of the deceased is permissible, and it is allowed to kiss and look at him for those who were permitted to do so during his lifetime, as indicated by the Sunnah.

Scholars have differed regarding the obligation of fulfilling the deceased's permissible will: some are of the opinion that it is obligatory to fulfill it, while others believe it is permissible but not obligatory.