Good art has something that is difficult to reproduce if one isn't already an artist who is just using AI as a medium - it's intentionality.
Take for example Floor796[0]. Every little detail counts and while you could use AI to generate single characters or even the whole thing, you'd inevitably find details which have no reason to be there. You could then remove them manually or modify your prompt or input image so that those you know about won't appear, but AI being AI will keep sneaking in new ones.
The longer your prompt, the more intentional everything becomes, effectively making it the art piece.