Painting Mountain Rivers/Streams
There are many patterns in nature. Mountain rivers/streams are usually clear and there is lots of turbulence. Water patterns are quite fascinating. Just observe the wave formations and eddies of water. Watch for a grid work of flow lines as water flows over a rough surface. Painting water is challenging as you learn to separate the transparent from the more opaque. As in this painting, a clear pool of transparent water breaks into more opaque of the moving water. Moving toward the background there is more reflection from the sky and surrounding objects hence for more opaque. The foreground calls for transparency as you peer into the depths and river bottom.
Although these are not of mountain streams, I put up some Winslow Homer paintings.