A combination of deepening blue sky, contrasted by pink clouds, and of course the moon. Good reasons to turn your back on a sunset!
Gold on blue colour contrast makes for a pleasing nature photograph.
A number of classical compositional themes here, the single figure on a “rule of thirds” placement, the single contrasting colour element (the umbrella) against the generally muted earthy tones, the recurring lines, and the rock textures.
the seed heads of these tall grasses along the creek bank provide a study in gold and blue