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It could be below the Pharoah's head in the safety net bit.
It could be up the skyscrapers to the right.
It could be up the satellite dishes to the left - there are two routes up that way.
I don't think there are any tag points at the top of the Pharoah's head.
If you look at the map, the tag points are the small orange dots. If you rotate the right analogue stick you will be able to see if the tag point is high up or on ground level.