Do you not want to damage the wall by nailing a picture to it? You can use duct tape. It will hold your picture nicely and not damage the wall. Cut a piece of duct tape. Fold the duct tape in half lengthwise, with the sticky sides facing each other. Cut the folded duct tape into two smaller pieces and attach it to the back of the picture, making sure that it's centered and level. Press the picture onto the wall, using duct tape strips to hold it in place.

@How to Hang Pictures/Lowe's Home Improvement/YouTube.com