The still shows Dench and director Sam Mendes about to shoot a scene from the upcoming spy blockbuster, which will see Daniel Craig play Ian Fleming's iconic secret agent for the third time.
The official James Bond 007 Facebook page revealed the image earlier today (February 21).
The social site's update also revealed that a special videoblog from Mendes will arrive at 7am GMT tomorrow (February 22).
"The roots of my doing this Bond movie start way before anybody approached me because, like everyone else, I have my own personal relationship with Bond which began when I was I suppose about 9 or 10 years old," he said. "I've always been a fan of the movies."
Skyfall's plot sees Bond's loyalty to M tested as a figure from her past re-emerges. Ralph Fiennes, Javier Bardem, Berenice Marlohe, Naomie Harris and Ben Whishaw are among the supporting cast for Skyfall, which debuts in cinemas on October 26.
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View the latest on-set pictures from Skyfall: