Maybe just a coincidence, but it's strange how the image has so many themes in common with the second book of the harry potter series.

The painting is a chamber of secrets. The secret is the private key we are seeking.

 - Ron, Harry, and Hermione play a game of chess.
 - They are ensnared in a vine called the "devil's snare"
 - Dumbledore's phoenix punctures the eyes of the basilisk
 - Gryffindor corresponds to the element of Fire (http://harrypotter.wikia.com/wiki/Hogwarts_Houses)