Thanks for posting this photo, Ronald - I hadn't seen it before. Some interesting modifications to the tank are visible, including the roof stowage and damage to the starboard lower front horn inflicted by the Turkish demolition charge. Sand shields can be seen on the inner front horns, and the idler sprocket has been replaced with a non-toothed version (which were manufactured in the workshops of the Egyptian State Railway following the loss of a transport bringing spare parts from the UK).
Those who wish to build a model of a tank at the Third Battle of Gaza may be interested in this description from D.G. Browne's "The Tank in Action" (1920). "..as the attack was due to start in the night-time, the tanks were variously camouflaged to suit the conditions amid which they might expect to find themselves at dawn. Two were daubed with different colours, and another pair were painted white and splashed with sand, while the remaining four were disguised with imitation cactus."
Browne's source appears to have been the "Report on Tank Operations in Egypt and Palestine" submitted by Maj. O.A. Forsyth-Major, the 2ic of the Egyptian tank detachment. I have been unable to track down a copy of the report, but it is excerpted at length in Browne's book, and Fuller's "Tanks in the Great War" (1920).