If you are doing any kind of photography in school, below you will find some tips for producing powerful photos.
Composition - how you choose to frame your picture will tell a story.
Poor composition makes for unsatisfactory viewing and makes the viewer feel that something is wrong in the picture.
Strong composition has exactly the opposite effect - the viewer instantly understands the story being told, and feels like the photographer has "nailed it".
Here are some links to help you with photograph composition:
Rule of Thirds - one of the most important concepts in creating powerful photography
Use of Shadows
Horizon - where you place the horizon in your photo changes the effect of your photo dramatically
Rack Focus - deciding whether to have the object(s) in the foreground or background as your focus
Pic Monkey - photo editor