Possible Clues:

• Striking red songbird in another's nest to start with
• He painted it, twice going round article
• Venetian artist who gave his name to a hair-colour
• Prominent Venetian Renaissance painter
• Artist: Hyperion, for example, inspiring one
• Giant squeezing head of Italian painter
• Double it up with an Italian master
• Kind of red bird seen by Celt
• Artist places boy behind bird
• Venetian artist placing boy behind bird