Two of my Paris drawings, of Montmartre and La Maison Rose, are featured in a curated collection at Artsper...
'A contour line in all its simplicity is the marking used by artists to define the shape of their subject without using shading. Essentially, they outline the subject, with emphasis on the mass and volume rather than on the details. A fundamental element of any drawing or painting, contour lines are often the first technique adopted when experimenting with art.
As a contour can convey a three-dimensional perspective, length and width as well as thickness and depth are important, and not all contours exist along the outlines of a subject. By altering the type of contour, an artist can convey details aspects of its subjects relating to their shape and form. For example, a lighter line with less gradation suggests a greater distance between the subjects, whereas a darker portion of the contour may depict a subject with little or no light source, thus conveying whether the subject is lower or perhaps compressed. Furthermore, artists use contour lines to add accents or cast shadows.' ARTSPER