Here is the selection for the creative artist, art dealers, antique dealers, poets, and other art-themed roles: 

Dr. Bon's notes on creative character roles:

If you are an artist, interior designer, art gallery manager, art dealer - feel free to dress up in one of the painting costumes, like the Mona Lisa or The Screamer costume.  Bob Ross costumes are also really good for artist roles. 

Antique Dealers are great with steam punk themed costumes - be a bit eccentric and wear vintage jewelry pieces, or do a 1920's art deco dress.  Anything offbeat and fashionable is great. 

Poets and authors can wear any of the pirate/renaissance shirts and maybe black or the black and white striped pants with a nice vintage hat or steampunk goggles. You want to put an eccentric twist on it so you don't look like everyone else - you consider yourself to be an extension of your creativity.  Poets and authors also can wear a Gothic costume.