Clearing a photograph is a two-level process:
Anyone who uses a photograph for any reason must obtain permission from the owner of the photograph, usually either the photographer or a stock house. Magazines, newspapers, and wire services also often own photographs.
You must then address the issue of what is depicted in the photograph.
Is it a person – do that person’s rights have to be cleared?
Is it trademarked (buildings such as the Chrysler and Empire State Building are now protected by trademark), a logo, a brand, a work of art, or a scene from a film that requires separate clearance?