I felt inspired.
First steps done in RawTherapee, giving this:
EOS_70D_IMG_0337.CR2.pp3 (10.2 KB)
Then I used my G’MIC “illustration look” filter in Gimp, followed by “freaky detail” to give this on the top layer:
I used G’MIC separate the foreground from the background sky, applied some gaussian blur to the sky, did some cloning/healing to give this final result: