The phrase "art big on" can be associated with a variety of synonyms. One possible alternative phrase is "enthusiastic about art." Other synonyms include "passionate about art," "eager about art," and "keen on art." "Art aficionado" is another term that can be used to describe someone who is particularly interested in and knowledgeable about art. For those who are deeply invested in the art world, "art connoisseur" may be a more appropriate phrase. Regardless of the terminology used, it is clear that those "big on" art have a deep appreciation and love for creative expression in all its forms.