Scumbling: Non-linear, rough brushstrokes meant to create texture. Technique is often a dry-brush technique. It is often used to create foliage, hair, clouds, etc.

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Seurat, Georges: Georges-Pierre Seurat (1859-1891) was a French painter and part of an art movement called Post-Impressionism (aka Neo-Impressionism). He invented the art-style called Pointillism, which uses a series of dots to create value and form of a painting, instead of brushstrokes.

-Wikipedia

Shade: A shade is any color with black mixed in it. A shade of red is maroon. A shade of blue is navy.

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Shading: Creating a smooth, blended area representing a shadow. Shading involves spreading the graphite or charcoal on the drawing surface and rubbing it with either your finger or a blending stump, or even lamb skin.

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Signac, Paul: Paul Signac (1863-1935) was a French painter and part of the Post-Impressionists Art Movement. He worked with Georges Seurat, learning pointillism and took the style to the next level, calling it Divisionism. Divisionism creates separate and distinct areas of color, versus dots of pure color which, when viewed at a distance, optically blend.

-Wikipedia

Silverpoint: A stylus made of silver, used in drawing in the 14th and 15th centuries because of the fine line it produced and the sharp point it maintained.

-Gardner's Art Through the Ages

Sketch: A sketch is a quick drawing often used to get the basic composition worked out on paper. Sketches rely on form and outline versus highlights, shadows, and detail to convey their points. Many artists use sketches as a foundation for more detailed and sophisticated works of art.

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Split-Complements: According to the color wheel, which breaks colors into a blended spectrum, blue going to violet one way and toward green another way, a split complement is the color to either side of its complement. In the case of blue, orange is directly across the color wheel, so the split complement would be red-orange and yellow-orange. In the case of violet, yellow is its complement. The split-complement would be yellow-orange and yellow-green.

-Art Fundamentals

Stylus: A needle-like tool used in engraving.

-Gardner's Art Through the Ages

Surrealism: Surrealism is a style of artisic expression which was influenced by Freud's views of human psychology, emphasizing fantasy and whose subjects are revealed through the subconscious mind. It was also a literary movement which grew out of Dadaism, established by a literary manefesto in 1924.

-Art Fundamentals

Symmetry: Symmetry is the exact duplication of appearances in mirrorlike repetition on either side of an imaginary straight line down the central axis.

-Art Fundamentals