height
In general, artwork should be hung so that the center point of the picture is at eye level for the average person. While this won't be possible in every situation, it's a good guideline to keep in mind. Remember a grouping of pictures should be thought of as one unit.

arranging
Test an arrangement of pictures by laying everything out on a large table (or on the floor), playing with combinations until you hit upon one that works. Laying them out on paper is even better since you'll be able to trace around each object and determine where picture hangers should be installed. Tape the paper up on the wall as a template for picture hangers and you'll be done in no time. It’s also a good idea to form the outside bundaries of a picture grouping - the measurements within which the smaller pieces of art will be set. This will create unity even when hanging prints with different themes and with dfferent frames. (Picture 1 top)

relate to furniture size
(Picture 1 top) also demonstrates how artwork or groups of artwork should be smaller than the furniture it’s placed over.

relate to wall size
Choose smaller pictures for narrow walls and larger works for big wall spaces. A hall wall could be accented by hanging a set of prints. One or two larger vertical pictures would have been another possibility for this space.

light well
Lighting can give artwork importance. Spot lighting can banish dark hallways and make your art collection much more dramatic.

create an art shelf
Art shelves are a great way to add interest and take up very little space. Artwork can be hung on the wall over the shelf as well as set onto the shelf with other decorative objects.

colour and size
Match or contrast for your room scheme. Choose artwork that underscores the mood or theme of your room. Is the room vibrant, pastel, or neutral? Is your furniture casual, formal, modern, or traditional? These are clues that will help zero in on the type of artwork that compliments the colour and scale of a room. Vibrant colors bring excitement to a room while neutral colors are more calming.

bigger is often better
One large painting or framed print makes a statement and keeps things simple. It can also call attention to the focal point of the room which is often the fireplace.

horizontal lines
Strong horizontal lines in artwork, or in the way artwork is framed or hung, tend to be calming and can give the illusion of width in a narrow room.

vertical lines
The arrangement shown here (bottom right) is made even more dramatic by hanging the prints one above the other, furthering the sense of height.