Garth Williams’ illustrations for “Charlotte’s Web” are as much a part of the book as the words, bringing the animals to life with personality and gentle humor. Williams’ daughter Fiona was the model for Fern. His family put up 42 of his drawings for “Charlotte’s Web” for auction in October. The results exceeded estimates. The familiar cover drawing of Fern holding Wilbur under the web-draped title sold for $155,350 and the illustration of the web “Terrific” went for $95,600.