Think about this:
1. If you don't do anything else, crop the top all the way down to eliminate the "Welcome To." That maintains the context and tightens up the overall shot. It also gets rid of all the distracting arch stuff. Immediately looks better to me.
2. You might add some dimension by darkening the background. You can take down the overall exposure a good bit. That will darken up those distracting window areas and it will recover some of the highlights in the people faces and light clothing. Then up the light in tone adjustments and take down the dark or shadows even more as needed. The challenge here will be to maintain detail in the black faces; that's always hard when dealing with blacks and whites.
Overall, a good shot. The only people problem is the dummy looking at his shoes -- but there will always be one and he'll live with his mistake every time he looks at this picture.