A photo background doesn't have to be "busy" with a lot of detail to compete with the foreground. It can be simple like some distant mountains (or buildings) like in this picture. I misted the photos with dul-cote to give them a hazy off in the distance look.
Mike
Sent from my pocket calculator using two tin cans and a string
Mike,Unlike rolling hills it's harder to blend in a industrial scene where everything looks like it belongs.You just need to use industry photos that looks like they belong with the modeled industries.
Excellent job by the way.
Larry
Engineman
Summerset Ry
Make Safety your first thought, Not your last! Safety First!