Now this lead to LOTS of Googling and MANY polarised views! Some people like to sign on the actual print in black pen; others in metallic silver or gold. Some leave a white border around the whole photo and then sign in the slightly larger white space below the photo (making sure they use the correct sized optional mount so as not to cover up any wording of course). Others print their image with just a white space below the photo for signing. Others dislike this as it gives a 3-sided closed look to the image. Some artists/photographers just write on the back of the print so that the signature, photo name and any limited edition number go with the artwork. Some sign the front AND the back. Arghhh! I decided to sign the back of the photo in black pen and the mount with a pencil. Then even if they bin the mount my details are still available on the back of the photo. Read this good article about where/how to sign.