These about shading tonal values.
In developing a value, you will create an illusion with areas of tonal value. When you use a hard line drawn to define the edge, you disrupt this illusion. Is the edge defined by two different spheres of the meeting of the tonal value.
The purpose of the realistic picture is to show your shadow and light and surfaces, creating the illusion of three dimensions. The line defining the edge is visible and not say anything about light and darkness. Line drawing and the drawing is a representation of two different "systems. " Mixing the two can be confusing, if the image is realistic is your goal.
When you create pictures of value, you must be out of fashion change of line drawing, and the best way is to forbid me to draw a line, and focus on areas of value. You can use a line of light to the base form. From there, the shadow of the building. Often, the "outline" is the junction between two different values, and created by the contrast between light and dark.
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