Quite often objects are photographed by antiques and arts dealers in a casual way without much regard of focus, light exposure and surrounding. It is quite understandable. When new arrivals must be quickly photographed, all these necessary preparations are being neglected simply by lack of time.
By no means we would advise you to change this practice but even encourage you to keep on taking photos in this rather loose way, provided they have sufficient resolution. You may continue the way you like as we are specialists in transforming casually taken photos in enticing pictures which are often little works of art in themselves.