Here is my promised process post. I start by drawing the basics in pencil. I then proceed to ink the borders and outlying elements such as his tie and hair. After inking, I go in and fill the major elements like eyes, mouth, and nose. Then, I draw out all of the shapes that I see inside the subject. Once those are drawn, I proceed to fill in the shapes, not piece by piece but rather making them overlap. I save the ears for last as those are my least favorite thing to draw.