Dave,
Nice build. If you want to lightened it up, this is where most would dry brush to highlight and simulate sun bleaching.
You could also lightly spray some color like Buff on the sides and tracks to simulate dust.
Now for nitpicking...
The cable on the side was used for reinstalling the tracks. While sometimes the crew would overspray them while painting camo or whitewash, they would usually be a dirty metal.
The same for the heavy tow cables on the deck.
Also, the tracks should sit on top of the roadwheels like in your signature pic.
I like your build a lot, Good work.