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The darkening of the face of the deceased indicates a bad end

“Darkening and changes in the face because of terminal illness or after death are not indicative of a bad end or that the individual was not righteous. This often happens for physiological reasons, such as low levels of oxygen in the blood, or pooling of the blood in a particular place… or other pathological causes. 
There is no shar‘i evidence to suggest that darkening or changing in the face at the time of death is one of the signs of a bad end. No one should be deceived by the many stories that are told concerning that.” [Islam Question & Answer]
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It is recommended for a person to prepare his shroud before he dies

“Preparing one’s own shroud is not something that is recommended, and the Prophet (blessings and peace of Allah be upon him) did not advise people to do that, but it is something that is permissible, and it is narrated that some of the Sahaabah (may Allah be pleased with them) did that.” [Islam Question & Answer]

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