In most portrait photos, the subject's eyes look directly into the camera. Have your subject express a variety of emotions to capture a unique photograph. You could also try to have the people in the picture look at something in the frame.
A good photography tip that can help you is to take a step back from your work sometimes. A picture you might not have like before might suddenly seem appealing to you. It's very important to step back from your work so that you can always have a fresh perspective.
The current photo assignment is about shooting low angle photography. Since I gave the assignment, I figured I probably should provide some instruction.