Make a “blind contour” self portrait. A blind contour is a drawing where you do not look at the paper while you are drawing, and once you have put your pencil or pen on the paper, you don’t lift it again.
Get all your materials prepared, and position yourself in front of a mirror. Pick up your pen or pencil. Look at the paper and put the tip of your utensil into position. Now, look in the mirror and start drawing your portrait. You can go as slowly (or as quickly) as you like–just don’t look at the paper until you are finished!