Two pieces of original artwork from the covers of JK Rowling’s Harry Potter books are set to be auctioned. The watercolours, painted by Cliff Wright, are featured on the second and third instalments of the series. One of the pieces, which was featured on the cover of Harry Potter And The Chamber Of Secrets, shows the boy wizard and Ron Weasley in a flying car and is being sold with a reserve price of $20,000 (`12.17 lakh). The second is taken from Harry Potter And The Prisoner Of Azkaban, and has a minimum bid of $12,500 (`7.6 lakh). The online sale is set to end on March 27.