I recently did a photo shoot for a doctor's office. It was on the beach with ten staff members (all women), took me about an hour to shoot, plus about 5-6 hours pp. One or two of the photos will be used for ads in the paper, one will be used for a billboard. I have never done a commercial shoot, and have no idea what to charge to release the photos to them for their advertising purposes. Any ideas would be greatly appreciated!