Adventures of Superman#446 cover color guide on ebay!
Another color guide, this one with a cool color scheme, due to Gangbusters costume, against blue and black. As I try to tell folks, it's not how many airbrushed variations you use, it's about the basic color choices, that make for a striking cover. I honestly believe we do better with less, and are more creative trying to get more out of a limited palette, than with an endless number of color variations to choose from.
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