"Magazine illustrations" refers to the pictures or drawings that are created and used in magazines to enhance the content or tell a story. Full definition
It includes the book's skipping past paintings before 1960 and the sheer weight of magazine illustrations after New Masses. (haberarts.com)
I found out in comic books that there was a group called illustrators, and I would also see magazine illustrations. (booklistonline.com)
Meantime, for the next couple of years (1913 - 16) he earned his living in magazine illustration, producing graphic art for the left - wing magazine The Masses, and later for The Liberator in the 1920s. (visual-arts-cork.com)