The collages do not depict all the mustaches in any of the films, and many of the mustaches are fake, either for the film in general or within the film as part of characters' disguises.
They are presented in order from least challenging to most challenging. I apologize for the terrible image quality of #5, but when you find out what it is, you'll understan why it's like that.
Submit your answers by email to me at bethlovesbollywood at gmail dot com. Please do not leave them in the comments of this post—that might accidentally spoil the fun for someone reading after you. The answers, including the collages showing the entire screen shots from which each mustache is taken, will be unveiled the morning of December 1 (IST).