In Alberto Manguel, A History of Reading
(New York: Penguin Books, 1997), p. 5, there is a reproduction of "a forest scene by Hans Toma" showing a boy seated in the woods reading a book. The plate credits on p. 357 give the location of the painting as Staatliche Kunsthalle, Karlsruhe.
The painting is actually by Hans Thoma, not Hans Toma. It struck my fancy, and I searched on the World Wide Web for an electronic copy. I couldn't find one, but I did find two other paintings of readers by Hans Thoma that I liked equally as much:A Peaceful SundayThe Artist's Mother in the Little Room