As you can see you will be spending a lot of time sketching in his nicely shaped hair. You can do this with a series of soft straight strokes that curve inward a bit depending on the position. After you do this, sketch in the wrinkle lines on his forehead which he only has three of and then shade in his eyeballs and give him some nice long eyelashes. Shade under his left eye very lightly to give definition and sketch in the crease lines on his bottom lip. Start the side burn on the right before moving to the next step.