The Paizo publication, "Chronicle of the Righeous" has descriptions on several outsiders.
Outsiders Explicitly Interested in Art
Angels are often inspired by the dreams of mortal to create artwork in the Ethereal plane.
The drifting dreams of mortals often inspire angels passing through to create phantasmagorical works of art.
These living sculptures, paintings, and melodies swirl around the bastion in an scintillating haze of insubstantial monuments, colors, and sounds.
Archons are described as having an interest in architecture, especially a particular symmetric and grand style.
Azata love art. They build fantastical homes and furnish them with different art forms. Further, they organize into "courts" which are centered on particular artistic media or styles.
They make their homes in fantastic structures, from heavy silk tents embroidered with spun gemstones to lofty bamboo palaces. Most azatas maintain multiple homes and change locations frequently in accordance with their shifting alliances within azata society. These alliances— called courts—center on art, music, philosophy, and personal taste, and spring up almost as quickly as they dissolve. Though a few permanent courts exist in Elysium, their membership changes like the plane's fickle winds.
If you want something more villainous, consider Asura. The description doesn't explicitly say they favor artistry, however the flavor of the text certainly paints that picture. Asura are contemplative and focused, often philosophical. They brood over their feelings of rejection. And they are evil - generally focused on destroying the cosmos.