In this image, the blur of people moving around in the crowd makes it look interesting, but it is also focusing on particular people who are standing, walking, moving in what looks like a busy area. A slow shutter speed is used in this image.
This picture was taken with an incredibly fast shutter speed so that it could quickly capture the flying water droplets. The reflection adds so much more of an interesting view to this picture; because it's as if you're seeing it double.
I have highlighted this image because I like how the image is simple yet effective at demonstrating how light can be used in photography. This image was created with a high exposure setting which would more light in the image such as the trail, The trail