Hi George,
Looks like a solid build. The things I noticed are; a seam in the extinguisher, also compared to the vehicle the tools and stowage box on the side of the hull show little or no wear or tear.
Think if you put some dust (pastel chalks) in the recesses and around the hatches it might help.
Looks like the inner roadwheels need a bit more paint on the inner surfaces.
The color is hard to comment on (for me) as some of the stuff I've posted looks much brighter than in real life.
Good job, perhaps just a few little things to change / add and you'll have a winner.
Joe