The key to representing any sort of rhythm or variety for a certain photograph would be to look out for any striking patterns or perspectives for a certain object, place, or thing. Using this you can photography something as simple as a rainbow and still be able to show some variety in the image. As an example, I took a photograph of a double rainbow, through a window which has raindrops scattered all over it. This created a somewhat of a surreal atmosphere. Furthermore, the rainbow on the right (but furthest to the left), clearly contrasts the difference in light as its left is shown to be very bright, and its right is shown to be quite grey and cloudy.

Perspectives and effects like these can help capture a rhythm in you photograph and can be the key to encapsulating a special moment as well.