When composing your picture, pay attention to the weather. If it is overcast outside, try to keep the sky out of your picture as much as possible. Black and white pictures are also a good choice if you want to shoot outside on an overcast day. If the weather is nice and sunny, you will get a lot of great pictures, just make sure your subject isn't squinting at the sun.
Make use of the instant feedback you get from a digital camera. The screen on your digital camera can show you the basics of how your photo came out the instant you snap the shot. Learn from your mistakes and take another shot, there's no need to wait for your prints anymore.
Look for patterns in your subject matter, no matter if they happen to be natural or artificial. Patterns add an appealing aspect to a photograph, particularly if they are repeating patterns. You can play off these patterns to get unusual angles or frame your subject relative to the background.