I am new to the business and had my first real commercial use request of one of my pictures. I was contacted by a Swiss ad agency that wants me to take another picture like one that I have already taken and use it for a campaign at the EURO 08 soccer tournament. They want to print it life size and cut out the face of the person for kids to look through and take pictures with. Does anyone have any experience with this? I don't want to overcharge and lose a cool opportunity, but I don't want to under charge and undercut other photographers. Thanks for your time.