I start by making very small, really basic sketches in different compositions. This allows me to visualize what I have in mind and decide if the idea is good.
I do my drawing in pencil, I refine the lines, I erase, I start again. Many of my drawings were made in Moleskine Art Plus notebooks with thick 165g paper.
Inking is done with an assortment of Staedler pigment liner pens (0.05 to 1.0mm leads). I start with the thick lines, then I go into detail with the finer lines.
In order to colorize on the computer I need to scan the drawing in the highest possible resolution. I make sure there are no gum peels left and go to the local kombini (Japanese supermarket) to do my scan.
I start by colorizing the drawing with the colors that seem suitable for each element. Little by little I adjust, I experiment, I start again until I get what I want.
And There you go!