Line them up. For a fool proof way to have your photo wall looking picture perfect, line up all the bottoms or the tops of the picture frames (whichever you prefer). If you are looking to hang a large number of photo’s, create two rows with the top picutres lining up along the bottom and the bottom pictures lining up at the top. This essentially creates a straight line down your wall. Here is a photo that explains this much better than I ever could!