Therefore, this is my new, updated challenger 2 model post!
The model itself was a joy to build, Tamiya included some nice litle touches such as clear goggles for the crewmen and clear plastic mineral water bottles that even have tiny decals for the labels on the bottles! To paint it, I mixed Tamiya Acrylics XF59 Desert Yellow and XF57 Buff. To get the right mix of paints, I did a thorough search online for pictures of Op Telic Challenger 2s, the resulting mix of paints, I feel, is as close as I could get to all the pictures that I managed to find.
Challenger 2 of the Queen's Royal Lancers, Op Telic, Iraq 2003
Compare the above picture of the real Challenger 2, with the following picture of my model, I think I have got the paint scheme just about right.