Hi Darren: Thanks for sharing your model with us -- nice work! Here are some areas that could enhance this or future builds for you:
1) use your digital phots. Looking at the 2D image, you can see things your eye might otherwise miss on the real model. I see areas of your suspension and lower hull walls where you missed adding weathering/dirt/mud.
2) using pre-made stowage can be a timesaver -- but make sure you file/cut/form the items so they conform to the tank surfaces. Your pile of bedrolls/sacks, etc "floats" over the engine deck. Try to make sure everything conforms like real bags/bedrolls would
3) The inside of the turret mounted spotlamp cylinder wasn't silver but olive drab. That cylinder was a shroud to direct the light beam
4) Here are pics of how most US-made tail lights appeared:


5) Perhaps replace the tie down rope you have across the jerry cans? It appears very out of scale. I use embroidery thread: right diameter and no "fuzziness" made by the loose fibers.
Hope these help! Keep up the good work