I compared the photo above with one of your screens. The perspective is not 100 percent the same, but there shouldnt be too big differences:
Dunno if its because of the paintjob, but compare both wheel cases and the white lines. The front is more or less okay, seems a bit too high or big, but the rear one is under the top white line at the real fire engine, your wheel case isnt.
Another things is, your windows seem to be not high enought. It took me some time too see it, but if you compare them long enought with the real ones, especially the front one, you will see that the roof, or the whole top of the truck, should be some cm's higher than now. You can see it pretty good at this thing in the middle of the car, it isnt as high as the real part, so are your windows.
And theres the reardoor of the cabin. As you can see at the first picture, the arch of the wheel case needs half of the door, which doesnt look like that at the real truck. Seems like your wheel cases are just a little bit too large, the wheels are too large and the car is too far away from the floor + the roof seems to be a bit too low. The result is, that it looks like the truck is too flat and at the same time too high.
Lol, I hope you understand me.
