During our photo trip to Namibia, we also flew across Sossusvlei in a small airplane. During this flight I took a.o. this photo. It was still early in the morning, so part of the dune was still in the shade. The way the wind has shaped this part of the dune, created a nice Yin & Yang like interplay of dark and light colours.
As the photo was taken from an airplane, I had to use the de-haze option in Lightroom quite intensively to make up for the milky haze introduced by the plexiglass. Also cropped the original image to a square, to strengthen the Yin & Yang effects.