Use a glue bottle to outline the drawing once the portrait is drawn in pencil on cardboard ... getting to be a little silly ...

Photoshop CC 2021 tutorial showing how to transform photos into retro-style, color pencil drawings. ****NOTE: From 4:15 - ...

The latter: “The Thin White Duke,” one of the portraits in “Icons,” Verwey's solo Caprice Bistro exhibition of abstract ... grit and the eye-grabbing color, along with an air of ephemerality.