2.) Balance: Place main subject off center, like rule of thirds, but have another subject less important to fill the empty space.
3.) Lines: Naturally drawn lines, straight, diangonal, zig-zag, etc.- Draws people to the subject.
4.) Symmetry and Patterns: Catches your eye, and has symmetry and/or patterns.
5.) Point of View: Different angles and positions to take the photo from. It can make the image appear big or small.
6.) Background/Foreground: Don't let the subject blend into the background or foreground. Make it so you can focus on the subject by making the background plain.
7.) Depth: Created by having things in the foreground, middle and background.
8.) Framing: Natural frames isolate main subject, creates a more focused image.
9.) Cropping: Getting close to the subject to eliminate the background.
10.) Break the Rules: Experiment with photos, take many photos see which works best.