These pictures demonstrate various compositional techniques including rule of thirds, balancing elements, leading lines, symmetry, patterns, different viewpoints, background, depth, framing, cropping, and experimentation.

2. These pictures demonstrate rule of thirds.

3. These pictures demonstrate balancing elements.

4. These pictures demonstrate leading lines.

5. These pictures demonstrate symmetry.

6. These pictures demonstrate patterns.

7. These pictures demonstrate different viewpoints.

8. These pictures demonstrate background.

9. These pictures demonstrate depth.

10. These pictures demonstrate framing.

11. These pictures demonstrate cropping.

12. These pictures demonstrate experimentation.