The water was so turbulent and the trees were so green. Photo taken in 'video' mode at 16:9 aspect ratio, close to the panel size used for this painting (10x16, near-golden ratio). I could have cropped it to 10x16 but in the field we try to minimize steps needed for the painting.
Some of the pencil marks from the armature are visible at this stage. Initially, I pencilled in a Golden Spiral and Basic Dynamic Symmetry Armature on the 10x16 panel . I then did a value study of the scene, using a small rectangle with the same proportion as the 10x16. I made sure that rocks lay along the spiral leading up to the top of the water fall which I intended to use as the focal point. Then I marked off the horizon line (across the river) using a 'Squeegee" along an implied horizontal line through intersection points of the grid/armature. With a Catalyst wedge I painted the dark parts of the rocks.