Possible Clues:

• Big name in serigraphy
• Onetime Folies Bergère regular
• One-named fashion illustrator
• Old Harper's Bazaar designer
• Collectible lithographer
• Art deco illustrator for Harper's Bazaar
• Pseudonym of the artist Romain de Tirtoff
• Artist whose moniker is the pronunciation of his initials
• Harper's Bazaar cover artist, 1915-37
• 'A Dream' artist