Anything you can do to help me make them look better would be appreciated.

There's no obvious difference btw wall and ground (or roof) in the bg tiles, took me a while to get it. Contrast would help lots, but also some specific texturing.

Edit:



I've strongly raised the contrast (and the saturation a little), it still looks dark.
You need to check that monitor: there are test patterns online, you should find one. Otherwise you'll never know if what you do isn't completely off the road on most viewer's monitors. For critical jobs, a calibration device is a must.
But it's maybe only that your eyes get used to whatever you're drawing! It's a terrible fact that the human eye adapts easily to almost anything. Spend long enough working on a piece with a blatant unbalance of anything and it will start looking normal. That's why it's important to stand back from one's work once in a while ;)

I changed the brick edges relatively to the light source (as guessed from the bridge) on both wall and road (the curb shadow indicates a slightly different light source though).
Texture on a wall is likely to have a 'dripping' look which is a good indication of a vertical surface.
Shortened the road bricks (3 versions, each in 2 widths), yours are probably too long because of the view angle, they should look foreshortened. I hinted at cracks for texture, in a not too convincing way. Should have used 2 colors (one bright + one dark) to give them volume. Also worn off corners.

you just got heavy cc + an edit. so if you're going to bump, it should be with an update.