Look at the shadow in this photo taken earlier. The shape is changing before my eyes. One of the most difficult things I find about composition in Plein air painting is the changing light conditions. Everything about the light changes minute by minute. Intensity, position, reflections, shadow shapes, even the hue changes. With all of that going on however, it also offers an opportunity.
oil on canvas board
The opportunity is for the artist to add something personal. Since it is impossible to copy the changing scene directly, I find myself improvising. That is the very thing I like to look at in other artists work. Their improvising or personal touch.