In a comic I draw, the main characters play Pathfinder, and in one storyline their characters were shown.
Since I was already coming up with profile images for these RPG characters, I had the idea to use them as prints for an upcoming convention I'm attending.
Then the idea came up to use the images on functional character sheets (albeit pretty substantially redesigned from the typical layout, but still a character sheet), and selling those as prints, though at much less than a typical full-illustration print.
I'm going to put a "Permission to photocopy for personal use" at the bottom, plus "Pathfinder © Paizo Publishing, LLC", along with a copyright covering my own characters and their character designs, but would I need to include anything else?