Following the Astral Demons concept art, check out a batch of Doctor Strange alternate designs for Mads Mikkelsen's Kaecilius including a cool look at his transformation when he was pulled into the Dark Dimension at the end of the movie.
The images are from the Doctor Strange art of the movie book which is now available on Amazon at a discount.
"Doctor Strange" has a November 4, 2016 release directed by Scott Derrickson starring Benedict Cumberbatch, Rachel McAdams, Tilda Swinton, Benedict Wong, Chiwetel Ejiofor and Mads Mikkelsen.
Synopsis:
Marvel’s Doctor Strange follows the story of the talented neurosurgeon Doctor Stephen Strange who, after a tragic car accident, must put ego aside and learn the secrets of a hidden world of mysticism and alternate dimensions. Based in New York City’s Greenwich Village, Doctor Strange must act as an intermediary between the real world and what lies beyond, utilising a vast array of metaphysical abilities and artifacts to protect the Marvel cinematic universe.