Australian promotion printed for the release of the series soundtrack on CD.

This poster is rare, but more importantly is is quite valuable because it is the only one of two posters I have ever found that uses the famous "Welcome to Twin Peaks" shot that is so famous from the opening credits of the series.

Similar to the inside pullout of the CD soundtrack, the poster features small mug shots of almost all characters in the entire series, including "Diane":

Closeup of the main image: