The Goal of Art Depends on what you believe about humans. If you believe we are created by God, then there would be the conscious goal of art in the mind of the artist, which could be anything, but that would likely be an illusion, and god would be manifesting the art through the artist for his own strange unknowable goals.
Or if you believe god is hands-off like deists believe, then the illusiory goal from the previous example would actually be the real goal. Same with if there is no god at all.