well i think you did a good job on the hair and the eyes, and the wrinkles are okay, but i think the wrinkles could be made better if you added some darker graphite to parts of the wrinkles, along with blending them a little more. maybe what your seeking is some skin texture? cross hatching, lightly or a bit more heavily in areas, will gives the skin more texture and make the face look more realistic. remember, if you don't already know, when looking at a person, object or animal in real life, they don't have outlines. even on wrinkles you should not see a line.