Whats best way to detail levels/prevent way too much detail?

my main issue with making games that im having is level design no matter what to me it looks too under detailed, like here im trying to make an abandoned hospital lobby, it fells like it makes sense that theres not many things in the screenshot, because irl in abandoned buildings most stuff is stolen, but at same time it just fells to underdetailed and no matter what type of level im trying to make i always reach same issue and im not sure how to improve that and not have these issues anymore https://imgur.com/a/PODxf8f