I'd say focus on your major forms. The main cab's roof that meets with the top of the windshield is a different shape than what you modeled. The main cab also is rounder at the rear-top than what you have as well. The windows don't quite line up with the reference material either on the sides or the rear. Notice how the windows all end at roughly the same level at the top and bottom. Whereas the windows on your door are really high in comparison.
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