This image is a four-times-monoline. Meaning that the surface have been touched only 4 times: one coherent line with the black water soluble pencil, one with white, one with water and one with a marker for the background. This one is located at "Johannes Indramning",  Danas Plads 9, Frederiksberg C from where it can be purchased. You might even like to have it framed nicely there too. I don't ship this particular one.