Forests are closed spaces. Here I made the trees and canopies lean into teach other to create volume around the stream, and to help frame the character in the foreground.
The water was a bit trickier - I wanted to experiment with values and shapes to show different depths within the stream (with the added complication of shadows, of course). Bright, converging lines (red) imply deeper, more turbulent water. Darker, diverging lines (blue) surround shallower water where the underlying rock can show through.