The other night I was over at my friends' new house and she asked me about where to hang her art and picture frames. This was a great question, and one that I believe a lot of people struggle with.
You don't want to place your art/pictures too high, but you also don't want to place them too low. They key is to place everything along the line of sight (or eye level). This eye level will vary from person to person, so the idea is to place it on the average eye level (approximately 5' high).
Here are some examples of how to effectively hang your art and pictures in order to create your own gallery in your home.
As you can see, there are so many options and combinations of arrangements that you can hang your art/pictures in. Just remember not to over do it by crowding your walls. Use the rule of thumb that "less is more" and let the room breathe.