For the record, the only agents I have representing my work are Booklyn; who focus on placing reasonably-sized art-on-paper at institutional collections, especially within the U.S. They've been instrumental in getting my work into a number of university collections (listed here).
No art-dealer for larger works, no literary agent, and certainly no film/TV agent. Most of my dealings have been conducted as a “free agent” so to speak, which, quite frankly, I would like to change, because I am now spent af.