Create highlights using the knead eraser and finally, clean your drawing.
If you want a softer detail and want to achieve realism, use tortillion for finer blending, this artwork was done with marsmagno (staedtler) graphite pencils B,2B,4B,(6B for very dark tones), nylon brush, kneaded eraser and 1pc 9x12" 100gsm/24 sheet textured sketchpad. This is my first tutorial lesson, hope you guys would help me out by posting your comments so can make it better next time.