What is a one-sentence summary of the following article?
It’s hard to draw hair accurately without at least the outline of the head. You need to see how the hair flows in relation to the head as you’re drawing. Use a reference photo and draw the outline of the person’s head, including the top and sides (even if they’re covered by hair). To draw a head without a reference photo, sketch an oval that’s narrower at the bottom. Make sure you leave enough room on the page for the ends of the hair. You can adjust the shape of the chin later after you draw the hair. Start at the top of the head and draw the top and sides of the hair around it. Leave some space between the hair and the head since hair has volume and isn’t perfectly flat. Then, draw the flow of the hair as it cascades down past the face and around where the neck and shoulders would be. The exact shape of the outline will depend on the style of the hair you’re drawing. For straight long hair, draw a straight line on each side of the hair, running from the top of the hair to the ends. For wavy hair, use wavy lines to draw the sides of the hair—the bigger you make the wavy lines, the looser the hair waves will look. For curly hair, just draw the outlines of the curls around the top, sides, and ends of the hair. Don’t worry about drawing all of the individual curls yet.

Summary:
Draw the outline of the head. Sketch the outline of the hair.