When we talk about the "art level", we usually refer to the quality or skill of an artist. The word "level" indicates a certain standard or degree of proficiency. The opposite of "art level" would be a lack of skill or a low level of quality. Some antonyms for "art level" might include words like amateurish, unskilled, unpolished, or crude. These terms suggest a lack of experience or natural talent. On the other hand, words like mastery, expertise, or excellence would be synonyms for "art level". These positive terms indicate a high degree of proficiency or skill.