Why would an artist want to vary the line weight in a drawing

Question

To control the color of the line
To create crisp analytical lines
To make implied lines stronger
To make the drawing more interesting

Answer 1

To create depth and dimension
To add emphasis to certain elements
To create a sense of movement and direction
To create texture and contrast
To add visual interest and dynamics to the composition.

Answer 2

One answer

Answer 3

To make the drawing more interesting.