Resisting the urge to add giant sandworms (or gum gum people), this was mostly an exercise in shading and simplicity. At one point I was going to keep going, then sat back and said, “Nope. Done!”
The dry brush used in the top half is meant to suggest a starry sky. I think it mostly works, though things went a bit awry in the lower-right area, but I decided to leave it.