How Mario Zucca manages to say so much with so few lines is a testament to his talent. His illustration style is clear and easy to read, and his color works well. I would guess that the color is probably done digitally. On his website he has a series of portraits from his high school yearbook in scratchboard. They are quirky and fun to look at.
Several things about this image are worth mentioning. I love the textures on the surface of the table and the floor. They are made with rows of line segments. This gives more character to the surface than if the lines were totally straight and continuous. The lamp is another example of varied line treatments as it turns from dark to light.