When I finished the top picture, I cleaned my brushes and packed away my supplies and thought..."There...job done!" But, I am learning that its wise to sleep on my work and let it lie for a day.
When I returned to it the next day, I saw the picture with fresh eyes and a clear mind. I realized then that the picture didn't pass the test.
It didn't take much to give the picture life: a bolder and more dramatic sky, and lots of cloud shadows on the forest line below the mountain, and even the suggestion of a cloud that loses its edge and blends with the forest on the right side.
Interestingly, the end game was all intuitive. I simply mixed my paints, and laid them on and watched the picture come to life. It was right brain play, all the way.