This just looks like a new light colour setup with an added vehicles. I can see you added shadows to the piece, but they're entirely too light and blend in with the rest of the scene too much. While some visual noise is good, when the piece is nothing but visual noise there's overkill and the piece's lighting and naturalistic fidelity is lost.
To demonstrate, with this new piece - when blurred - there's still no contrast besides the sky & the main geometry. The car adds a nice chunk to it.
The more I see this the more I think a faster solution would be to adjust shadow colour and opacity, then move in the composition to show LESS of the scene. Since you probably don't want to re-do the art for this piece, I think adjusting those to things and tightening the view would work. Focus on a few key areas rather than the whole thing.