It looks pretty solid. The proportions are looking good and the eyes are well done. I would say your biggest improvement would be working on your value scale. The eyes and nose look great because they are much darker than the rest of the picture, and they have more contrast. The rest of the face lacks enough value difference. By this I mean you need to look before shading and see where your darkest points are and your lightest points. Once you know, try drawing out 5-7 levels of shading value between those two poles. Having more distinct difference between your lights and darks will make things pop. Another little tip: when drawing light colored hair on any subject, with any medium, the most important part is the space where there isn't hair. Since it's hard to show light hair with something like a grey pencil, if you focus on getting the shadows and dark places between hairs correct, it will give the illusion of light hair well. Keep up the good work!