Possible Clues:

• Michelangelo's "The Last Judgment," e.g.
• Wall design
• Community art project, maybe
• Painting (of a wall?)
• P ain't this largely on the wall
• Many a Keith Haring work
• You are said to be featured in short man's picture
• Many a commissioned piece
• Painting Scottish island, artist shades loch
• W, all art