Motivating myself to change!

[Herc Driver]

Even that simple and minor addition really adds some depth to the overall look of the back drop. Telephone lines in front of the buildings would certainly break up the "flat" appearance too. Would the possibility of adding an elevated roadway from one side to the other be a possibility? I'm not sure how much depth you're working with there...but it's quite usual for a major highway to cut right next to large factory buildings like those. (All the highways cutting through St Louis come to mind, as does Philadelphia, Pittsburgh, Cleveland, and Chicago and NY/NJ for inspiration.) I'd still suggest adding a roof (thin styrene sheeting) to suggest a roof over the walls and maybe even add a few open windows to vent fumes and all air to pass through as so many buildings like those had, and maybe the end I-beam of an overhead crane sticking out from the top of the wall.

But even what you've done there looks better than before - nicely done!