Are the arts as we know them on Earth or has your world(s) developed its own? Are the arts taught in schools or are they treated as a hobby to be indulged in outside of normal educational activities? (What are those on your world by the way?).
Are the arts respected or treated with contempt (usually because they are not so obviously practical as, say, engineering and the sciences)? Does your world(s) import art from other universes (my Fairy Queen likes photography and, frankly, has lifted the entire idea from our world)?
Who are your artists? Would your reader recognize their type? What is the background of your artists? And how do the majority of the populations (the "ordinary") relate to the arts?