The golden rule of hanging a picture is to have the center of the photo be at 57 inches. This reflects the standard eye-height of the average person, and is used as a standard in most art galleries and museums.
So you’ll need to measure 57 inches on the wall and lightly mark with a pencil.
Next, measure your picture and divide by two, in order to determine the center of your photo. If you have a tightened wire on your picture, you’ll need to measure the top of your picture to the tightened wire. Take that measurement and subtract from half of your picture height, and this will tell you how high above the 57 inches you should go. Lightly mark this total above your first mark on the wall and hang!