Here are the source for the amazing Hazbin Hotel based wallpapers, I am truly in love with those drawings and I cannot recommend you enough to check out the artists DeviantArt / reddit accounts.
Reverse Angel Dust
Nice Angel Dust: this link or this link
Hazbin Hotel crew
In this folder, there is a version of the Angel Dust wallpaper in BMP so it can directly be used as a splash image for sbupdate.