For me art is the creation of something fresh to express an idea, an emotion, it's something done once or first.
Once we step into creating copies we move somewhat away from art toward the world of engineering, manufacturing, production, standards; the stuff of commerce.
Photographic studios a reasonable example. A typical portrait done in a studio has only three variables, setup, pose, and subject.
The setups are normally pre designed and provide incredibly accurate and predictable results. These setups are little production lines designed to churn out "similars" where the the only thing that changes, yes over simplified here, is the face.
The work of many studios is exemplary, but is it art or simply production/business?