I would have done an excellent job in fact I used to do it in my other house that if I removed everything absolutely everything from the space to wallpaper and paint, protect my floor and then get to work without throwing dust or make a mess like the one you are showing us.

Please, who would think of doing a wallpapering and printing job without removing all the belongings from the space!!!!

No wonder the color turned purple and blackened like an anal hemorrhoid.