Light Pencil Work Giving Depth to a Sketch

This page is the CodyCross answer for the clue below from House of Horrors, Group 1103, Puzzle 5 (Uninvited Guests).

Question is: Light Pencil Work Giving Depth to a Sketch

and the answer is: SHADING

Word Meaning:

SHADING — present participle and gerund of shade

Definitions from Wiktionary.