I did this plein air painting near Dry Falls in eastern Washington a year ago last fall, didn't like it, and finally tweaked it in the studio. It might be like training a bonsai- I had to wait a while to see what to do next. At this rate, it should be done in a few years!
oil on panel, 9"x12"
An interesting geological aside: A LOT of water raced through here when the ice dams gave way during the last ice age, carving these dramatic coulees. Nice and dry now, though.