Here are some great minimalist hero posters designed by Grégoire Guillemin. I like the simplicity of these Spider-Man, Superman, Batman, Hellboy, and Silver Surfer illustrations. The colors and smooth lines are great. Check them out below thanks to HeroChan:
You can buy these from the artists store!
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Source: HeroChan (http://www.herochan.com/post/17305209377/smooth-minimalist-heroes)