>>25715>>25719My belief is that art is a piece of media created with the intent to further virtue.
Beauty and excellence are virtues; therefore a sculpture, for example, that communicates the beauty and excellence of the human form is art. The sculpture doesn't necessarily need to have any other meaning besides the persuit and expression of beauty and excellence, however it may.
Now for an example that isn't stylistically excellent. Early medieval paintings usually don't have great anatomy nor use perspective, however that is not the point of these artworks. These paintings often dipict Christ and religious themes. The point of these artworks is to further the Christian virtues. So using the virtue-lens of art, it does constitute art.
Art is good if the attempt to further virtue succeeds greatly, in the medium used itself and in the effect on the audience.