Bamboo shading

The first sumi-e book I bought was Kay Morrissey Thompson's "The Art and Technique of Sumi-e". Written on the base of Ukai Uchiyama teaching, Thompson focuses more on monochrome painting. However, it was Jean Long's book "Chinese Ink Painting, Techniques in Shades of Black" that tells me much more about the subject. I painted the image as an exercise in shading.