Eyebrow pencils with a smooth, light texture and soft, dry finish are good for filling in eyebrows and give them a natural look too, while defining their shape. Begin application in the center of the brow and work outward toward the brow tip then back toward the beginning of the brow.

Use short, light strokes between the brow hairs, and apply a bit more pressure (for stronger color) when defining the underside of the brow. Use a clean toothbrush (or a brow brush, which is similar but more expensive) to soften the color and groom the brow. Alternately, you may apply a bit of hairspray to the toothbrush, and comb this through the brow for hold and control.

Keep in mind that most brow pencils deposit stronger color than a powder, so take care to use a light touch. If you apply too much color, soften the effect with a Q-Tip that has been dipped in makeup remover. Do not apply eyebrow pencil too close to the inner brow (near the nose).

Adding more than a bit of color here tends to create a too-strong or angry-looking brow.

A combination approach , using a pencil with powder, can give you the control and delineation of a pencil, and the softer, shaded look of a powder.
You can try shaping the brow with the powder first and then finish the detail work with the pencil or brow gel. This is especially helpful if you have bald spots in your eyebrow or need to slightly extend the end of your brows so they frame your eyes better.