Slow Rhythm
It's not a perfect example, but there is a sense of slowness to this picture. The line of the tree in the foreground, then the main subject of the tree in the middle ground give enough spacing and distance in the frame to make it slow.
Fast Rhythm
In this photo, not only are there many subjects, which creates a sense of quickness, but there are also many converging lines leading to one point. Together, that creates a fast rhythm.
Irregular Rhythm
The light coming into frame here actually creates many different shapes. And while this photo has a sense of quickness to it, it is mostly irregular, thanks to the pattern of the light.
I like how you used the foreground and the midground in the first photo in order to show the slow rhythm. The second photo is clutch. What a moment. The rhythm is boomin with all those people creating lines. The last photo is nice the way the light falls hardly on the ground. It is a bit quick, but I don't sense the as much irregularity as I would like to.