Start out with a basic sketch. Use basic guidelines to place features.
Clean the sketch up as much as possible. HB and F pencils for sketching.
Roughly and lightly shade over the drawing. Use a cloth/paper towel and an HB pencil.
Start by drawing in the eyes. Use a B pencil for the darker shading and a 2H pencil for the lighter shading.
Move on down to the nose and mouth. Don't worry about the surrounding skin yet.
Add in the dark shading on the left side of the face. Use 4B and B pencils.
Sketch in the hair using a B pencil. Pay attention to the natural flow of the hair.
Develop the hair's shading some more.
Roughly blend over the face with a darker value. Use an HB pencil and a cloth/paper towel.
Use an eraser to erase away the highlights of the skin. Kneadable erasers work best for this. Use a 2H pencil to define the light shading more.
Finish up the drawing by adding more definition to the hair. Use a B pencil for this.