This looks like it could be our first look at a series of character poster art that will be released for Robert Rodriguez and Frank Miller's Sin City: A Dame to Kill For. The poster comes from actress Crystal McCahill who plays one of the "Girls of Old Town" in the film.
Sin City: A Dame to Kill For is based on the comic created by Miller who is also co-directing the film, from a screenplay written by Academy Award winner William Monahan (The Departed). Rosario Dawson, Mickey Rourke, Jessica Alba, and Jamie King are reprising their roles in the film. Then there's Jamie Chung and Dennis Haysbert who are replacing Devon Aoki and Michael Clarke Duncan.
The plot for Sin City 2 comes from the stories A Dame To Kill For, Just Another Saturday Night, and a new one Frank Miller wrote called The Long, Bad Night, which apparently centers on Alba's character Nancy Callahan who will be the connection between the two films.
The movie is set to be released on October 4th, 2013. I'm sure we'll be seeing a ton of character posters for the movie in the near future.