The napkin, if I'm not mistaken, didn't lie across the face, but was used to tie up under the jaw, and around the head, to keep the mouth of the deceased from gaping open. That would leave the full burial cloth to cover the face and body of the deceased.
Both Jacob and Joseph set the precedent for the type of burial that would be given to Jesus’ body. They were wrapped up, wound, in linen, swathed in bandages, with spices. That is what is meant “as the custom of the Jews”. Jesus was greater than Jacob, greater than Joseph. We are not talking ordinary “put them in the ground before dark” kind of thing here.