Measure the amount of wall space you have to work with and work out your arrangement on the floor. Don't forget to include lamps and wall sconces into your arrangement.
Is my art going to be too big, too small??
Consider proper scale when decorating your walls. Support large furniture with large wall hangings and small furniture with small wall hangings.
How high should I hang art?
When hanging pictures above furniture the general rule is between 6 and 8 inches. If your art is not going to be above furniture, hang your pictures at average eye-level.