Which of the lines are not a main type of line in hockney' self portrait

Stylistically, the British artist David Hockney has been described as having roots in pop art, using highly graphic style referential to that of advertising. Linearly his mark-making is quite clean and sharp; examples of line type are contour lines and cross contour lines, which may come in the form of vertical, horizontal, curved, zigzag; Hockney uses throughout his art an array of these lines to create different effects.