How are lines used in realism painting?

In realism painting, lines are employed to create structure, define forms, and convey depth. They often delineate shapes and contours of figures and objects, enhancing the three-dimensionality of the subjects. Artists utilize varied line qualities—such as thickness and texture—to evoke different surfaces and details, contributing to the overall lifelike appearance. This careful use of line helps to achieve a sense of authenticity and meticulous observation in the portrayal of everyday life.