Their really isn't much to this step which is step 2. All you have to do is sketch in some brief detailing on the face, ears, and chest. Start by sketching the inner parts of the ear to give it that separation effect. Now sketch in the part that is usually in the middle of their enormous heads. Now detail the nose by adding a curved line right on top of the bridge. Now sketch in the subtle whisker definition around the nose. Lastly sketch in the lining for the arms.