Start with the head shape and hairline
Sketch the overall hair volume first
Divide the hair into large sections
Draw loose S-shaped strands for curls
Vary the size and direction of each curl
Add overlapping curls to show depth
Use curved lines instead of straight lines
Keep some curls tighter and some looser
Leave small gaps between strands for separation
Add shadow under overlapping curls
Darken the roots and inner folds
Refine the outer silhouette of the hair
Erase unnecessary guide lines
Add a few flyaway strands for realism