since gnome 42,there’s picture-dark-uri. It would be nice to have both light dark variants of wallpaper.
i feel it maybe out of scope for this community competition participants to include light and dark variants for their submitted wallpapers but the default wallpapers shipped by ubuntu that has the mascot should atleast support both variants.
Any detailed images of the moon might require additional care to show the copyright owner of the original photo has licensed it for modification and redistribution.