Note the curved line where the back of the dog's muzzle meets the head, and the two lines down the face suggesting the change of plane between the top and side of the muzzle. Some broken lines indicate the fur. Then the dog's eyes are sketched in, being careful to place them correctly and make sure the pupils are lined up. Sketch the shape of the nose and ears. I've also noted a couple of places on the head where there are changes of plane near the eyes.