When you are drawing with graphite, color pencils or any other medium tools always follow the direction of the forms. Look at the following pictures below; notice the direction of the goat hair and draw it in that direction. .
Notice the direction of the chin fur or hair. Pressing with the “B” graphite pencils such as a 6, 7, and 8 Bs. will allow you to see realism sooner rather than later. If you draw in values of 5,6, 7 H range you will not see realism in your drawing. It will be flat with not much blending of forms and shapes. Do not be afraid of using the B pencils which are cool in tone and will “go Back into” in space. If you are having trouble using the higher B pencil because you are afraid or just do not understand how to use them I suggest practice sketching with a few higher numbered B pencils. For example; use a 6, 7 and a 8 B pencils and draw a few simple shapes such as a sphere, a square, an apple. Use the number 6B as the lightest in the three range. Getting over your fear is the only way to break through to realism.