Light intensity is graphically represented by different colors or different values of one color. Its quality varies on all surfaces and sometimes even on the same surface, depending upon the position and angle of the viewer. The spot with maximum reflection usually appears to be lighter and brighter A long, continuous surface can exhibit a variety of intensities, due to interference from other objects and the texture of the surface from which the light is reflected. Three-dimensional forms should be obvious from the ways in which light and shadow fall upon them. Shadow should be used to direct eye movement. The path of light and shadow should be carried from border to border. Use strong basic shapes to define the shadow pattern. Don't attempt to capture a realistic pattern—this is the job of a camera. A sketch is not a photograph!
bold and dark honzontal lines in the foreground tend to lead the eye movement, creating contrasting patterns with the vertical texture on the wall
strong contrast of foliage suggests the roundness of the tree canopy
Expression of Light Effect
contrast in tone emphasizes the connection between the house and the roof
shadow of tree promotes diagonal eye movement across the page and leads viewers to the theme (house)
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