Roger,
A nice model all in all. The paint tone looks much better than the last model, in that the OD shade is not overpowered with wash.
The other guys have already pointed out the hatches color–that can be easily fixed. My main critiques will address the base and presentation.
In my opinion, a model–if it is decided that it will be placed in-situ, that is, displayed in a setting or on a base–can either have its impressiveness improved, or diminished by the setting as it is rendered. In other words, I believe that one should try to put the same effort and standards into the base as into the model itself. In that regard, I feel like your base could use some work to bring it up to the standard of your fine model.
It appears that this base is the bottom of something like a model car display case? In that case, you have to be creative, as a lack of depth behooves you to be creative in your placement of the model. Most experienced diorama builders will tell you to try to avoid placing your model in direct parallel lines with the edges of the base. Of course, as you can’t really do that here, you could get creative about inferring a “skewed” placement of the model.
Your “dirt” could look better.It is without definition in terms of tire tracks, ruts, etc–things you would see on a normal road. Also, the uniform color could be broken up by a border on one side of grass powder. And if that line of grass is made to skew slightly beneath the vehicle, it would give the illusion that the model is off-center—a good thing, IMO.
Try putting in tire tracks, even footprints–your “dirt” looks like something like mud, (maybe it’s the irregular borders?) yet there are no traces of the elements trodding upon it. Also, your model is “floating” of the surface–a heavy vehicle would sink into the ground in reality. Also, you might add some kind of vegetation somewhere to break up the monotone color?
Hope this gets you thinking! The model is nicely done–but the base could help to flatter it more, IMO.