When you are shooting a photo of someone, make sure that you are close to them to maximize the quality of the details on their face. This is very important, as you will want to capture every aspect of their expression to help to personalize the photos that you take.
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.
A great photography tip is to make sure your shots have depth in them. An easy way to achieve that is to be sure that you have a background, a middle ground, and a foreground. Having all three of these will give your pictures a sense of atmospheric perspective.