Welcome to the Q&A Forum

Hi Richard, I'm not a Google Images expert (otherwise I'd offer to help!) but you could check out the companies / individuals listed on Moz's <a>Recommended Providers page</a>. Many are agencies that prefer to work with people on longer retainers, but you may find someone to work with there, or the people listed may be able to point you to a trusted contact who specialises in images. I haven't heard of people specifically specialising in image search but that doesn't mean those people don't exist, or that you won't find someone who has a lot of experience with image-heavy photography / art websites. Cheers, Jane