Adam Brockbank's official website has a great collection of key frame and concept art he created for various big-budget Hollywood films. Let's take a look at the artwork that he created for three comic book movies: Joe Johnston's Captain America: The First Avenger, Sam Raimi's Spider-Man 2 and Zack Snyder's Watchmen (2009). For the 2011 Marvel Studios film, Brockbank worked on the interior of the Hydra train, Allied headquarters key frame art, future technologies exhibit and the army recruitment paviliion. For the 2009 film adaptation of Alan Moore and Dave Gibbons' highly-acclaimed graphic novel, Brockbank worked on Dr. Manhattan's cathedral (elaborate clock-like device) on Mars, as well as character designs for Ozymandias (Matthew Goode), and Rorschach (Jackie Earle Haley).
Captain America Concept Art
Watchmen Concept Art
Spider-Man 2 Concept Art