Conceptual artist Ryan Meinerding has just shared on his facebook account some cool images of concept art he worked on for Marvel Studios. The images below depict an early Mandarin design, Captain America wearing a version of the WWII costume, Iron Man's Mark 43 & unused Mark 45 armor, Tony Stark testing his repulsor boots, and War Machine.
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Fan of the site, been coming here for superhero news for years, not very active on my account but changing that.