Brazilian movie magazine SET has four different Watchmen covers for their September issue. You can view the covers in hi-res by clicking them below and scrolling down.
The Zack Snyder-directed graphic novel adaptation stars Patrick Wilson, Jackie Earle Haley, Matthew Goode, Billy Crudup, Jeffrey Dean Morgan, Malin Akerman, Carla Gugino, Stephen McHattie and Matt Frewer. Warner Bros. Pictures will release the film on March 6, 2009.
Source: Jungle Boy