Ive always defined ‘render’ as a means to complete a drawing or painting. Like a full fleshed out artwork if that makes sense

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i've always thought of it as going past flat colors. shading, highlights, little details, etc. when people list commission prices they usually separate flat colors and rendered pieces

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Rendering is the process of adding shadows, highlights, and very fine details like hair texture or even skin texture

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Hope the visual helps!

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