When Earl Mac Pherson went into service, K.O. Munson was drafted from the Brown & Bigelow stable to take over the successful 'Artist's Sketchbook' series. Sticking to the pastel medium, Munson replaced Mac Pherson's Petty smooth pin-ups with sharper, crisper lines, though the soft curves of his bright-eyed beauties were definitely appealing. He was a top B & B pin-up artist throughout the 1940s. He spent the 50s back in Chicago, where he opened his own studio, continuing to create pretty girl art for various companies.