If I’m not wrong, this is from one of the Candy Candy Illustration Books; Part 1 published in 1977 and Part 2 in 1978. All the illustrations were made by Yumiko Igarashi, and some of them have a poem written by Kyoko Mizuki, depicting the characters’ feelings in the drawing.
Set Of Various Doodles, Hand Drawn Rough Simple Sketches Of Different Kinds Of Desserts, Sweets, Candies, Pastries. Vector Freehand Illustration Isolated On White Background. - 250249513 : Shutterstock