I want to be a photographer's salesman. Who are the main target customers of this business unit?

Brand enterprises should do print advertisements, such as brochures, billboards, dishes, product manuals, etc. Mainly clothing brand enterprises produce new products every year, so there is a great demand, followed by furniture brand enterprises, which shoot a lot every year, and some newly-built enterprises need to make billboards, such as five-star hotels. There must be many difficulties at first, and it's nothing to do for a year.