I think the road looks strange because it's not in the same perspective as the wall/door. The curve on the round bits suggests the camera is fairly low, but the setts on the road being at 45 degree angles suggest we're seeing the road directly from above.
Squishing the bricks vertically would help a lot, I think:
You'd probably also want to make the roads to be squished more when they're running horizontally, and wider when they're vertical, to suggest perspective.
I also think that instead of having a dither overlay for the shadows by the sides of the road, you should make dedicated road-edge tiles.