The process of hanging a new painting or a collection of family photos can seem like a puzzle. Although there are pieces to examine, there isn't just one correct way to put them together. As with every aspect of decorating, it helps to understand the basic principles first, then improvise—the most pleasing arrangement may be the one you least expect. First, set out the pictures you want to hang; prop them against the walls, and consider your options. Look at every reasonable possibility. Have someone hold a piece up to the wall while you stand back and appraise (just cover the hanging hardware with masking tape first to keep it from scratching the wall). If you are grouping several pieces together, arrange and rearrange them on the floor until you find a composition you like.
In most groupings, a common thread will tie the pieces together. Perhaps the pictures are part of a set or collection; if not, maybe the frames share the same style or the mats are all the same color. Sometimes, a grouping may not need a linking element; the only unifying theme may be its diversity. Such collections take a little more nerve and are best suited to a less formal room. As for precise positioning, conventional wisdom suggests that pictures be hung at eye level. This notion is a fine starting point, but hardly definitive. There are many good reasons to hang pieces above or below a standard height. In any setting, you will need to react to the architecture and the furniture; you will also need to follow your instincts. A few inches' shift in a hanging arrangement can affect the tone of an entire room: Move the pictures over a sofa or chair down a bit; the area will become more cohesive, cozy, and inviting. Add an element of surprise to a room by hanging a little picture above the door. Emphasize a chair rail by running a series of photos right above it. Hang several small pieces just over a desk—they'll provide a refreshing view when you look up from your work.
Learn to trust yourself. If it feels right, don't be afraid to do something a little different.