Possible Clues:

• Paloma's pop
• With 31-Across, Spanish artist with a Blue Period
• Casals with a cello
• First name in cubist art
• Guerrilla leader in 'For Whom the Bell Tolls'
• Picasso who painted Gertrude Stein
• First name in Spanish art
• With 24-Across, Chilean poet with a Nobel Prize
• Nobel poet Neruda
• Spanish boy's name