Scanned from one of last years sketchbooks. Micron pens for basic sketch, added shadows with Koi watercolor pen, and used acrylic paint for the green background.
I had some leftover watercolor on my palette and added it to some old sketches. This is the Fabriano sketchbook with the red cover. I keep finding it on sale at hobby lobby. It's perfect for using on a plane, or just in general.