Tolstoy presents that for art to be considered art, it must be felt by more than just the artist, it should be felt by many people. The more “infectious” the art is (the more universally felt it is) the better the art is. Art must also be sincere, the artist had to have made the art in earnest.
The 3 standards given were that 1) that the feeling is transmitted. 2) that the feeling is clear. 3) that the artist is sincere.
If the standards are met, then the work is considered art. The degree to which the standards are met define the quality of the artwork.
I think this test does a good job of defining art. I think it adds an objective quality to the definition, while still being subjective.