THE AVENGERS ASSEMBLED: The Visual Evolution of Earth’s Mightiest Heroes

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Iron Man and Hawkeye are the most changed since their first appearances

Paul Antonson and Michael Calia have this great item at WSJ:
The bulky physique of the Hulk. The near-impregnable armor of Iron Man. The athletic ferocity of Black Widow. There are certain aspects of Marvel’s Avengers teammates that have remained consistent over the years, which is necessary to keep the characters always present in the minds of fans.
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But times change, and so must the appearance of comic book characters, even if just by a little bit. The Wall Street Journal’s graphics staff assembled Avengers cover images from the Marvel Unlimted app to study just how much things have changed in several of the main characters’ appearances over the past 50-plus years….(read more)WSJ.com