Doctor Strange's Zealots had a very identifiable look in the final film, but originally they looked vastly different.
Concept Artist Jerad S. Marantz worked on Marvel's Doctor Strange and released some early drafts of the Dormammu worshipping villains. In the final version the Zealots, including lead villain Kaecilius, represent their newfound powers with a magical effect around their eyes. It almost appears as if their skin is breaking to reveal another person inside, but the original concept had a different way of showing it.
As you can see below, the previous version shows the dedication to Dormammu through the skin as well, but here the worshippers are given a two palette skin tone. Certain parts of the skin are left their normal hue, while other parts are brightened to give the face an almost tattooed or helmeted look. You can see a before and after version in the image below.
Marantz posted the image witht eh caption "Early zealot exploration, for Doctor Strange. #zealot #drstrange #costume #conceptart #marvelcinematicuniverse #marvelmovies #comicbookmovies #villain."
The newer version prevailed at some point, most likely because it gave all of the Zealots a look more reminiscent of the magical entity they serve.
Doctor Strange has an 81.85 on ComicBook.com's composite ranking, which you can submit your score for here. The official description is included below.
From Marvel Studios comes Doctor Strange, the story of world-famous neurosurgeon Dr. Stephen Strange whose life changes forever after a horrific car accident robs him of the use of his hands. When traditional medicine fails him, he is forced to look for healing, and hope, in an unlikely place – a mysterious enclave known as Kamar-Taj. He quickly learns that this is not just a center for healing but also the front line of a battle against unseen dark forces bent on destroying our reality. Before long, Strange – armed with newly acquired magical powers – is forced to choose whether to return to his life of fortune and status or leave it all behind to defend the world as the most powerful sorcerer in existence.