In fashion Illustration outline for hair is very important. Rendering the hair should match the style of fashion statement, cartoon, classic or contemporary that the face makes. Hair styles can be of different types- straight, wavy, or curly.
Matching the drawing technique with the type of hair is important. Next time you are making an illustration remember to give attention while rendering the hair. The sketches seen here by Bina Abling shows how to draw out line of the hair for different styles.