You lost a lot of detail in the shadows, and the background is very busy/bright which distracts from the subject, I would've desaturated the background down but left the truck as is to make it pop. I would also crop out some of the foreground as it's not really serving any purpose and may ps another sky in there so the current sky isn't so blown out. Also I think it would be better if there was more "image space" in front of the truck rather than the rear. It's a nice truck a a nice angle though...

this is the advice of a nub though, so it is what it is