The conscious production or arrangement of sounds, colors, forms, movements, or other elements in a manner that affects the sense of beauty, specifically the production of the beautiful in a graphic or plastic medium.
I like the dictionary definition because they blatantly act like they are correct. Exactly what IS beautiful? Some people might not think Jessica Alba is hot, so does that mean if other people don't think the art is beautiful that it makes it not fit the "definition" of art.
On the other hand, you all might not care.