Very nice! The paint tonal variations sure add dimensionality and interest. Great job.
my steps:
Primer was air-brushed Vallejo Model Air (VMA) Primer, something like tan color. I am probably just going with tried and true spray-can primers, like Tamiya grey or black, from now on.
Post-primer paint was mix of VMA US Desert Armor, Camo Brown, and Light Brown. I also tried their Sand but it is pretty pink-ish to me. I did a first post-primer coat of the VMA Desert Armor, than tried the post shading technique I had seen on you tube, by adding the other two colors to different degrees in different areas.
(side note: I am working thru a lot of VMA I bought when I started back with modeling a few months ago, bought on LHS' recommendations. I have found that I do not like much about Vallejo Acryclics, what with the tip dry issues I have had even when properly thinned and flow improver added. And I don't like the rubbery look and feel of them versus properly thinned Tamiya paints.
Details like the tools and gear are mix of Tamiya acrylics and Testors enamels brushed on. I would like to try air-brushing Testors enamels but their jars are soooo tiny and certain common military model colors hard to find here unless you buy a set, and most places will not ship them here. So anyway, I only use Testors for small details but love how it brush paints.
I air-brushed the rubber tracks on the fret with AK Interactive Extreme Metals Dark Iron before adding them to the model after it was primed. after the skirts are installed much of the tracks are hidden, so just taped them off. I had painted the road wheels and sprockets already.
Next I coated it all with Vallejo polyureathane clear gloss air-brushed on, did the few decals, then air brushed on another poly coat.
Weathered with Tamiya brown panel line pin wash accent in joints and rivets, which gives it great depth and "oily" finish, and a little of their rust pin wash in a few places. After applying the washes I dry brushed and damped the excess off.
Then sprinkled on dry Vallejo pigments including umber and sand colors I think, and a little bit of AK jet exhaust pigment in a few places.
These either stayed dry and looked like sand collecting in spots, or they reacted to the oily wash and created nice stains.
Used a little bit of sand and umber pigments mixed with camo brown paint and binder for some mud on fenders and tracks.
Finished with spray can Mr. Color matte clear coat