There is no reasonable exception that allows an artist to produce works that fail to reach the standards of past masters. Those who have been given a gift for artistry have, in-turn, been called upon to train as craftsmen and, as craftsmen, should strive for perfection. An artist owes his audience excellence, and as that audience, you should accept nothing less.
...In the end, however, the art itself is of all importance, not the collections that house it, nor the education that built it, but the passion that inspired its creation and the dedication to quality that insures its permanence in the world.