Do you mean the background with the...posters or whatever, as opposed to the midground/street?
It looks strange that the solid-looking street just fades out into ??? there. What is that area meant to be? It looks like a misaligned photo at the moment. Work on defining/suggesting the structure of whatever it is first, then paint it with some of the duller colours from the foreground to make it fit, including some of those warm oranges.