British photographer Neil Turner wrote a post on his blog about customer expectations and customer-supplied photo guidelines.
Almost every commercial and PR client had a prepared guide that let you know what they wanted from a commissioned shoot and a few pointers of what they, or their end client, liked and didn’t like in their pictures. These ranged from really helpful pointers about what kind of clothing should be worn for portraits or whether or not images should have unfussy backgrounds through the obvious such as “images should be properly exposed” to the mildly bizarre “avoid any and all references to money”.
– Neil Turner