Hue/saturation and selective color to darken the sky in conjunction with channel mixer utilizing only the red channel. I then applied a curve to manage contrast and a slight USM with high radius to increase local contrast.
Too bad about sensor dust.
The two rock-stacks in the background are called Lóndrangar and are located on Snæfellsnes in Iceland. Those two are 61 and 75 meters high and are thought to be the remains of so called volcanic plugs.
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