It's done. Malachor is now complete.
I went with the color closer to vanilla as you all suggested and also desaturated the dark clouds a little bit. In addition to that I tweaked the terrain color a little and also improved the terrain itself so that you can no longer see where it begins. Here's what the result looks like:
But since this is an animated skybox, pictures can't really do it justice and so here's a video for you all:
And as always, there's also a render of just the skybox. Well, two actually. And I have them in two versions. One is the raw Terragen render and one was edited in a similarly to the skybox textures to get darker clouds at the top.
Next up is the Unknown World, but that's mostly fixing the skybox model for all modules and rerendering the skybox itself with some tiny tweaks. I'll keep you updated.