Obtain an image of Norman Rockwell that is at least 6 inches by 8 inches.
Tape the drawing paper to an easel or similar style drawing board that is larger than the image. For a 6 inch by 8 inch image use drawing paper that is around 8 inches by 11 inches.
Tape the image at eye level in a place that will be easy to see. Choose your favorite drawing media such as pencil or charcoal.
Start with straight lines and create an outline of Rockwell's portrait. Train your eyes by drawing first and then verifying what you have drawn second. Do not pre-measure details, but pay attention to symmetry and correct proportions.
Add features of Rockwell's face such as the eyes, nose and mouth. Draw lightly so you can adjust the lines.
Adjust your portrait as necessary. Confirm what you want to keep by increasing the hardness of the lines.