A case can be made for someone involved with art as maybe being to some extent & on that account 'intoxicated' with living & pleasant forms. As being heedless in regards to developing his good qualities & at that time not focusing on the theme of renunciation, on the unattractive, on the danger & loathsomeness of existent phenomena; and making others heedless & infatuated with living.
A producer of sensual pleasure basically. Trading in sensual pleasure. Sensual pleasures corrupt people.
However it's not like one is selling drugs or weapons. The harm to oneself and others can be relatively trifling for this or that person. I think it's closer to baking cakes.
Household life is problematic in general and one's household trade is best be closest to trading simple crafted goods or attending to good people. The Anagami householders in the texts, as far as i can tell, were either being lay attendents to The Buddha & The Sangha or making clay pots and trading those for essential requisites, not using money.
Their lifestyle too isn't ideal because it falls short of going forth into homelessness. The Anagamis i have in mind did not go forth because of sick parents.