Here is a link to School Library Journal’s blog about “re-illustrating” old books.  Publishers sometimes publish children’s book more than once.  These are called second prints, third prints, etc. depending on the number of times it has been to the printer before.  When the publisher chooses to republish sometime, they can also pair up new illustrators to give the book a new look and feel and (from their perspective) a breath of new life to the book.

Original cover

New cover

Here is an example of two book cover illustrations (classic and new covers) for the same book from the School Library Journal blog.  The new book has a contemporary feel to it and chances are more likely that children and adults will pick up a “newer” book than one that feels old and worn.  New illustrations may be spread throughout the book, and not limited to the cover design.

Click here to see more images (links to School Library Journal blog).