These photos are normally taken immediately after construction / remodeling. The company that does the work will stage the house - sometimes bringing their own furniture (which is likely what you are seeing here). The owner has not moved in yet and that is why they look so empty. This is not always the case though - sometimes a magazine or something will arrange a visit to a home they heard about and really like, and will arrange for it to be photographed - at which point the resident(s) might clean it up, but the place will actually look like someone lives there.