Delineation

[Sonia]

The act of representing, portraying, or describing, as
by lines, diagrams, sketches, etc.; drawing an outline; as, the
delineation of a scene or face; in drawing and engraving,
representation by means of lines, as distinguished from representation
by means of tints and shades; accurate and minute representation, as
distinguished from art that is careless of details, or subordinates
them excessively.

[PussyCat]

the action of describing or marking the edge of something: