Sketch the head shape and hairline first
Mark the main volume of the hair around the skull
Divide the hair into large sections
Add loose S-shaped and spiral curl patterns
Vary curl sizes and directions for a natural look
Keep the roots closer to the head and the ends more free
Use overlapping curls to show depth
Leave small gaps for highlights and texture
Define the outer silhouette with irregular edges
Add darker areas under layers and near the scalp
Refine individual curls without drawing every strand
Erase construction lines and clean up the outline