These are Wolflins Modes...They are the technical discussion of fine art.
Unity, Harmony, Rhythm, Balance, Contrast, Variation, Emphasis, Proportion, Transition
Color, Line, Form, Value, Texture, Space, Shape.
Art is a three fold process involving the Artist, The Art, and The Viewer of the art. Junk in Junk out, they say in the computer world. Artists view this world, or their dreams, or their emotions, or random imagery from this beautiful world, this chaotic world, this orderly world, this hateful world, this loving world; what ever the artist projects what ever the artist can make, record, witness and record. For every ideation, there is an expression, and then a viewer.
Norman Rockwell had a very affectionate eye in regards, to innocent Americana of his era. He comforts the American psyche. Edvard Muench was having some sort of day, when he painted The Scream. According to experts, the Mona Lisa is Michaelangelo's self portrait in drag.
There is a positive viewer for every object and a negative one, and an indifferent one. Find what you like, make a world that you like to look at, attract people to it that you like, and be happy. Don't worry if you feel alienated from Modern Art, a lot of Modern Art is about alienation. But, Modern Art is anything recently made, so there is Modern Art of every sort.