Drawing blond or silver hair is only slightly different from drawing other hair types. When I am drawing blond or silver hair, I just work a lot lighter.
Try using an H or an F pencil (harder graphite) sharpened to a very fine point. For the darker areas, try using a mechanical pencil. Keep it light, but remember to keep your contrasts of dark versus light areas.
I also like to shade very lightly around the outer edges of the hair, so there is a bit of contrast between the light hair. This is especially important when drawing on white paper, because you need to do something to create a difference between the paper and the person's head.To create a softly blended background like my example picture, try taking a darker pencil like a 4B, and rub it on a bit of scrap paper, then take some tissue or a chamois and rub into that graphite. Then in circular motion, shade in the background.
More on how to draw hair in pencil:
How to draw hair: Identifying the shapes, direction of hair
How to draw hair in pencil: Using blending techniques and erasers
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