Possible Clues:

• One drawing or shrinking back cannot, if far gone
• Writing on the wall for schoolboys if raised among corruption, earning nothing
• Count agreed with love message on wall
• Drawing of frigate briefly scribbled
• A mural scribbling
• Try collecting flyers suitable for Banksy work?
• Tag game outside involved tariff
• Grand artist with loud following -- one leading to work like Banksy's?
• German noble has tantrum over evidence of vandalism?
• Scratching on walls, pottery, etc