he face of the dead man shown in the picture was not covered during the Janaza at the Masjid a-Haram. What is the reason?

Whether he is performing Hajj or Umrah, whoever dies in the state of Ihram, his face is not covered. Prophet Muhammad ﷺ said, "Bathe him with water mixed (with the leaves of) lote tree and shroud him In his two (pieces of) cloth and cover neither his head nor his face, for he would be raised on the Day of Resurrection pronouncing Talbiya." - Sahih Muslim 1206f.

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