Possible Clues:

• Like star-cross'd lovers I enshrined in poetry
• Artist revealing a person beset by lines?
• Like Proteus
• Person in poem is a painter
• That's one in poetry from the Venetian school
• Marriage at Cana artist
• From the Italian, translated as 'overseen'
• Lines about individual Italian painter
• An Italian, overwrought, seen to collapse
• Poem about ace Italian painter