The cover is an combination of images from two sources. The Donald Duck figure is taken from page 7, panel 4 of "Jet Witch" in Walt Disney's Comics and Stories (Dell, 1940 series) #254 (November 1961), and flipped as a mirror image. The jack o'lantern is from page 13, panel 6 of the story "Trick or Treat" in Donald Duck (Dell, 1952 series) #26 (November-December 1952).
The top half of the page is a photo of Carl Barks. The bottom half is an illustration of Donald Duck drawing himself, with a text description of the pencils and pens Barks used for his work.
Back cover. A detail of Carl Barks' painting "Halloween in Duckburg."