My doodle art and my zentangles are both improvised and planned (sometimes very deliberately). Sometimes, I even do both: I choose a motif or a pattern that I want to use, and the rest is pure improvisation. “Dunes” is one of those part-planned, part-improvised drawing.
The materials that I used to create “Dunes” include an old book page (surprise!), a black ink pen (Pigma Micron by Sakura of America), gel pens and a metallic gold sharpie.