Bad virtual staging is obvious, and it damages trust in the whole listing rather than just the one photo. The tells are consistent: furniture that does not sit on the floor plane, shadows falling the wrong way or missing entirely, a rug that runs into a skirting board, and rooms so densely furnished that the space reads as smaller than it is.
Two habits prevent most of it. First, shoot from a corner with the floor clearly visible and the lights on — the floor is what the furniture has to sit on, and a photo where it is cropped or in shadow will produce furniture that appears to float. Second, under-furnish. A sofa, a rug, a lamp and one plant sells a living room better than a fully dressed set, because the buyer needs to see the room, not the styling.
Style for the buyer, not the seller. The purpose of a staged photo is to help someone imagine their own life in the space, which means neutral, current and slightly restrained beats characterful and specific almost every time. If the staging is memorable, it is probably competing with the property.