I had some idea about image, and start working on composition and lighting.
First result :
Look little bit empthy, added building and rework skys, to add colors.
Original:
Postwork:
In end like both of them …
Problems that i found, to vibrant on colors, people was position badly, over dark in coners, green roof to bright, take attention, ground low on details, need look more wet
And final image : 
Very interesting. It is funny how, just the placement of objects can change the whole feeling of a picture.
The postworked image is a bit overdone, and would need some finer touches if you wanted to show it as is. By toning it down with the original render you have kept the appealing textural touches as well as muting the colours. Good choice in handling this.