I know your mind has been made up, but please hear me out just this once. This is supposed to be a realistic painting, right? To make it work, then, you will have to draw things correctly, including their sizes. You can't use size hierarchy as the reason why you distorted certain thing's size. You can probably get away with it if it wasn't obvious, but this car issue is pretty obvious, preventing this image to become a superb illustration. You have a highly detailed soldier, very good looking smoke, flashlight shooting a beam of light, nice textures everywhere, light coming from a distance... and among all these great things, bang! A super tiny car.
I don't think the car is going to get too dominant at all, actually. I did a quick tweaking. See if you like it.

It's not too bad, right?