One of the principles of photography (and something that differentiates between a photograph and a snapshot) is that you place your point focus not in the center of the image, but at a position one-third of the way from either edge, or from the top or bottom. These photographs demonstrate this principle. If you are interested, here is a good post on the topic.
(Note: I took these images with a very cheap digital camera—a Vivitar F128. It cost around $12 and makes for a handy pocket camera for projects like this. But you can see some noticeable blurring around the edges of the images.)