Mount at the right height
In rooms with standard 8-foot high ceilings, most artwork should be hung so that the middle of the picture is approximately 5 feet (60”) off the floor. For rooms with higher ceilings, artwork can be hung a little higher, which will visually lower the ceiling height.
When hanging pictures above a sofa, leave an approximate 6” to 8” space between the top of the back of the sofa and the bottom of the picture. Over a tabletop or counter, allow 10” to 12” between the table surface and bottom of the picture. This space can be adjusted if you have lamps or other items on the table, which will visually add height.
Don’t clutter very large artwork with other, smaller pieces. Left alone, a larger piece will have more impact.