The image above is an example of Rhythm. The rhythm comes from the repetition of the metal pillars repeating the same form and pattern. This image works well because it draws the viewers gaze to the back of the image.
The above is an example of Dominance. The dominant object inn this image is the pink petals this is clear as the there is a flower in the background that is out of focus. This shows the dominance of the pink petals.
The above photograph is an example of the compositional design element: horizontal lines. The horizontal lines that appear in this photograph comes from the bench. This works well because each line can be easily noted and there are multiple which creates a rhythm or pattern.
The above photo is an example of the compositional design element Leading Lines. More specifically a curved line which starts in the lower left foreground and traveling towards the three figures in the centre. I think this is a good example as it brings the viewers eyes to the three figures in the centre of the photo.