Shading

n.	1.	Act or process of making a shade.
	2.	That filling up which represents the effect of more or less darkness, expressing rotundity, projection, etc., in a picture or a drawing.

Noun	1.	shading - graded markings that indicate light or shaded areas in a drawing or painting
	2.	shading - a gradation involving small or imperceptible differences between grades Synonyms: blending

arrangement, atmosphere, balance, black spot, blackening, blocking the light, bloom, blooping, brushwork, clouding, color, composition, covering, curtaining, darkening, definition, denigration, design, dimming, draftsmanship, eclipsing, extinguishment, flare, fringe area, ghost, gradation, grading, graduation, granulation, grid, grouping, hard shadow, image, interlaced scanning, line, melanization, mixing, monitoring, multiple image, nigrification, noise, obfuscation, obnubilation, obscuration, obscurement, obumbration, occulting, overcast, overclouding, overshading, overshadowing, overshadowment, painterliness, perspective, picture, picture noise, picture shifts, rain, rolling, scanning, scanning pattern, scintillation, screening, shadow, shadowing, smirch, smirching, smudge, smudging, smut, smutch, smutching, snow, snowstorm, switching, technique, telecasting, televising, tone, treatment, values, veiling