As an artist myself, I always love seeing the process as it differs wildly from one artist to the next! I am curious as to what reference you used for the Jeep itself:

As a WW2 Jeep owner, I immediately noticed this in your finished work. Not to pick nits that have already been picked, but us military vehicle types are pretty picky about such things. But along with that, we're pretty used to aviation artists missing wheeled vehicle details. Even Jim Dietz, who's work I love (and I'm in a few of his paintings) and has a great eye for "ground" details, has had some goof ups in vehicles. Even using collector's vehicles can be a risky thing as many collectors trick out their vehicles in ways not often seen on the battlefields. Many Jeeps back then lacked "jerry" cans and spare tires, they often didn't have working headlights and the windshields were down (or off) quite often as well. You also see Jeeps at air fields without the shovels and axes. But only "vehicle people" such as myself would know this after a lot of research…
Jeeps are deceptive things. They look so simple at first glance, until you either try to draw one or work on one. ONLY then do you realize how complex they really are!
