I sell through Alamy and all my best shots are on there. There's a link below. Their legal team go after infringements, so it also complicates matters if I use photos I'm selling on there in my own work. If I want to use one, I usually take it off 'exclusive' so some poor editor I'm working with doesn't get a letter from their legal team. https://www.alamy.com/portfolio/susiekearley