Spongenuity has been posting some wonderful portraits made with AxiDraw on instagram, including some CMYK ones like the one below.

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Portrait No.12 – Made with Axidraw, Steadtler Triplus Roller & Processing. Experiment with CMYK colour channels Each colour is drawn in a single, continuous line. . . . . . #axidraw #steadtler #art #plotter #creativecoding #creative #processing #processing3 #p5 #p5js #generativeart #artists #sketch #robot #dibujo #illustration @alexandrashipppp

A post shared by spongenuity (@spongenuity) on Sep 7, 2018 at 1:49pm PDT