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Subsurface scattering is an indirect form of reflection where some of the light is transmitted into a semi-transparent material, scattered under the surface and bounced back out again.
Jesus and the Adulteress, a sketched figure composition by Rembrandt Charcoal sketch of willows by Thomas Gainsborough. A sketch (ultimately from Greek σχέδιος – schedios, "done extempore" [1] [2] [3]) is a rapidly executed freehand drawing that is not usually intended as a finished work. [4]
Leonardo da Vinci's Vitruvian Man (c. 1485) Accademia, Venice. Drawing is a visual art that uses an instrument to mark paper or another two-dimensional surface. The instruments used to make a drawing are pencils, crayons, pens with inks, brushes with paints, or combinations of these, and in more modern times, computer styluses with graphics tablets or gamepads in VR drawing software.
There are various techniques of shading, including cross hatching, where perpendicular lines of varying closeness are drawn in a grid pattern to shade an area. The closer the lines are together, the darker the area appears. Likewise, the farther apart the lines are, the lighter the area appears. Powder shading is a sketching shading
Hatching (French: hachure) is an artistic technique used to create tonal or shading effects by drawing (or painting or scribing) closely spaced parallel lines.When lines are placed at an angle to one another, it is called cross-hatching.
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Ballpoint pen enthusiasts find the pens particularly handy for quick sketch work. Some artists use them within mixed-media works, while others use them solely as their medium-of-choice. [ 3 ] The medium is not without limitations; color availability and sensitivity of ink to light are among concerns of ballpoint pen artists. [ 4 ]
A luxury pen. A pen is a common writing instrument that applies ink to a surface, usually paper, for writing or drawing. [1] Early pens such as reed pens, quill pens, dip pens and ruling pens held a small amount of ink on a nib or in a small void or cavity that had to be periodically recharged by dipping the tip of the pen into an inkwell.