Possible Clues:

• Painter putting sign outside on a road
• Artist, architect, and engineer putting sign outside on a road
• Artist becoming fat and round having been around long time
• -- da Vinci
• Italian inventor has nothing on thriller writer
• Da Vinci's first name
• Mathematician Fibonacci
• -- Fibonacci, Italian who popularised the decimal system in Europe
• da Vinci
• 'The Virgin of the Rocks' painter