I agree with everyone else that, for your 3rd model, you did an excellent job. Seems all that lurking paid off!
That said, since you asked, there are a few details to be pointed out. First, the tracks are mounted reversed from what would be normally found (though I believe there are photos showing this happening occasionally). Second, the drivers view port needs to be painted to show that there is actually a vision slot there. Carrying that a step forward, and really getting detailed, all the vision slits and cuts in the headlight covers should be darkened to better represent openings. Third, both tail lights need their lenses painted. Next, the handles of the wire cutters mounted on the right fender were made out of bakelite. They should be a reddish brown (burnt sienna works well) in color. And lastly, the jack block was wood with metal bands and handles. While it is possible to find one painted body color, it's hard to believe someone would take the time to paint the sides, but leave the top it's natural tone.
You can easily incorporate a lot of these "fixes" on this model, or just keep them in mind on your next build. Hope this helps.