Art is any human expression of a subject with a sense of beautifulness that stem from it’s intelligence, skillfulness or creativity of it’s expression.
a story is any narrative like going to your exams and meeting your best friend.
a story can be a work of art besides it’s narrative content if it can rise to the standard .
one example of a story that is in fact an art piece is “100 years of solitude by Gabriel Garcia” .
mostly, the people with the right sense and knowledge will agree on what is artful. Van Gogh paintings fo example.