Possible Clues:

• Conservative, originally opposed, is backing new detailed artwork
• Painting fresh out of decorating forces
• Mural painted on a wall
• Michelangelo painting
• Painting using watercolours on plaster
• One enthralled having got back care of painting
• Forces change in form of decoration
• Picture menial worker keeping up with military leader
• Mode of painting on walls
• Michelangelo's Sistine Chapel ceiling, for one