Possible Clues:

• George --, painter particularly noted for his sporting scenes and paintings of horses and lions
• Horse-painter's remains bishop interred
• Painter using blunt end of brushes, hollowed out
• Painter in squat, mostly silent at first
• George --, painter known for his pictures of horses
• George --, English painter noted for his pictures of horses
• Painter's fag ends picked up
• He painted a vessel with a little boat on board