It's great, but it has a slight washed out look due to the lightness of the lead/pencil you used. Try creating a harsher contrast between light and dark shadows, this will add more depth and bring out a well defined volume adding life to the portrait. Be bold and not afraid to sketch with a 2Bencil and then reinforce with a dark 4B pencil that will define shadow and make areas more in the light stand out with eye catching shine. Applying this will make items like hair and fabric more realistic; but this is still awesome regardless. Nice job.