Waves. Rocks. Brightly colored leaves.
An experimental photo. I took a long exposure of the stream, and panned the camera along the length of the stream. Anything not changing comes out as a pure streak, while the bubbles and other features that changed over the length of the exposure stand out.
a little wild 
You photos seem underexposed (dark).
Paul L.
>
Many people would agree with you! But it’s also an artistic choice, to choose which parts of it we want to emphasize, and which parts we want to see details of. For me, this tends to be a good exposure, but many people would feel that this is underexposed.