Glass and metallic objects — especially those with curved surfaces — have complex interactions with light and their surroundings. Space becomes distorted, so don't trust your assumptions;
concentrate and closely examine the subject. Always begin with an accurate outline of the form — you need to be sure that proportions and outlines are all correct before shading.
Glass and metal objects are defined by the way in which they reflect and refract light, rather than by their surface color or texture. Drawing these objects requires careful observation and precision because the tonal values must be very accurate to create a realistic sense of depth and form. A sharp hard pencil is an ideal drawing tool
Distorted reflections require you to suspend your imagination and draw what you see. It often helps to faintly map out the principal areas of dense shadow and highlight - the extremes -before tackling the mid-tones.
Space, media, and expression
The way you place an object within its surroundings will shape the meaning of a drawing. You can choose to isolate the object from its environment, focusing attention on its form and surface qualities, or locate it within a scene that invites the viewer to explore. The media, and the quality of the marks, also set the pitch of a drawing — whether it informs, moves, or challenges the viewer on an intellectual level.
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