Marilyn Monroe memorabilia is some of the most sought after in the movie collectibles industry. An authenticated signature on her photo can brings hundreds or thousands of dollars, depending on the quality of the autograph, the photo, and who is interested in buying the picture. The right combination of elements could create a buying frenzy, driving the price up. Begin by contacting an expert on Marilyn Monroe memorabilia and ask for an appraisal (it is best to get two or three) to get a general idea what the value might be, and why it has that value. If you get an evaluation you like, and are interested in selling the item, sell it to a vendor or put it up for auction – the auction will probably bring a higher price. You can auction the photo through an auction house or through an on-line auction website.