There are many ways to hang pictures or art on a wall. As a general guide, follow these tips if you desire your space to be perceived in a particular way:
1. Formal Decor - hang your pictures or art vertically. Think of a soldier standing at attention. This is a good option for most any space.
2. Casual Decor - hang your pictures or art horizontally. Think of someone reclining or lying down. This is a good option for bedrooms.
3. Use the design principle of Movement when hanging pictures or art on a staircase wall. But, as shown in the photograph this method of hanging art can be used in other areas.
For more tips, follow my tweets under redecorating.
Enjoy your space, Rena