Step 1 :
Wet the entire paper except the part where the river flows. Drop in the local colour.
Step 2 :
Paint the distant mountains. While the wash is wet drop in some darks to indicate trees.
Step 3 :
Rewet the area below the horizon line and paint in the tree lines.
Step 4 :
Wet the entire area to the right of the river and add more trees varying he colour, sizes and shapes.
Step 5 :
Wet the are to the left of the right river bank. Add trees and reflections.
Step 6 :
Add some details to the trees.
Step 7 :
Strengthen the water area in the immediate foreground with a yellow/blue variegated wash.
The finished painting.