Final answer:
Gilbert Stuart, an American painter, never completed his painting of George Washington, known as The Athenaeum portrait. This unfinished portrait is the basis for the image of Washington on the one-dollar bill.
Step-by-step explanation:
Gilbert Stuart, an American painter, is the artist who never completed his painting of George Washington, also known as The Athenaeum portrait. This unfinished painting is the basis for the image of Washington on the one-dollar bill. Stuart used this portrait as a reference for about seventy-five other portraits of Washington.