When I paint scenery I do it in stages. My initial pass gets it looking good and playable in minimum time. Months or years later I go back to it and add another layer of detail.
If I can be bothered.
I must say, considering I was doing it as fast and detail-less as I could, this came out looking a lot nicer than I expected.
I wanted to go for a white colour scheme (which I hadn't; as yet; seen elsewhere) but to make it more naturalistic and interesting I blended it from dark grey bottom to top.