The volunteer coordinator at the animal shelter I shoot for has a rescue operation on the side and is moving to a new and improved location with greater visibility and foot traffic. She wants to print some of my photos (24x36 and up) to put on display. She also wants me to have business cards available for potential pet portrait work from passersby and give me photo credit. I have absolutely no problem donating the images, but I want everyone to be protected.... especially me. I know we should have a 'usage agreement' so she can have my permission to display and possibly sell the print. I certainly want to keep the rights of the images for any possible sales. Any links to such an agreement or your sage advice will be greatly appreciated.