Possible Clues:

• Wall painting survives, higher
• Salt's ruined important meal with terrible consequences?
• It's commemorated on Maundy Thursday
• Important biblical meal
• Painting of model's footwear (detail)
• Common religious artwork
• Work of Da Vinci remains superior
• Da Vinci masterpiece, with "The"
• Subject for da Vinci
• What cobblers need — part of shoe that was depicted by Leonardo