In late 2013, master doodler Kerby Rosanes released an awesome coloring book, not just kids, but for people of all ages. (We're looking at you, adults.)
Doodle Invasion: The Highly Detailed Coloring Book That Adults Love
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Doodle Invasion: The Highly Detailed Coloring Book That Adults
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Kerby Rosanes : Illustrator : Portfolio - Doodle Invasion