For 10 points, give the surname of the artist of  Christina's World .
An artist with this last name depicted Jim Hawkins looking up at Long John Silver's parrot in one of the illustrations for Scribner's edition of  Treasure Island .  Portrait of Pig  is a popular painting by the youngest of three generations of artists with this surname on view at the Brandywine River Museum near Philadelphia. A farmhouse made famous by an artist with this surname was made into a museum in South Cushing, (*)  Maine. An artist with this surname who painted numerous portraits of his German neighbor Helga Testorf depicted a young woman in a pink dress picking berries in a painting that appears to show that polio-afflicted woman crawling towards the distant Olson farmhouse. For 10 points, give the surname of the artist of  Christina's World .
An artist with this last name depicted Jim Hawkins looking up at Long John Silver's parrot in one of the illustrations for Scribner's edition of  Treasure Island .  
Wyeth  [accept Andrew  Wyeth  or N. C.  Wyeth  or Jamie  Wyeth ]