Hi Steve, I don't know why you think you are in over your head, your drawing is excellent so far. I am particularly impressed with the eyes.While I can't point out any specific areas in you drawing to help you with (it looks great to me), I will throw out a few general things that seem to work best for me:
1) Always use high quality paper. I always use Bristol (smooth or plate). The surface is very durable and I think the smoother finish gives me more control in blending, lifting, and error correction. Also, if you want your drawing to last, you want to make sure that you are using acid-free archival quality paper. I always use the best materials I can afford.
2) I build up my values gradually in layers, blending in between each layer. This is time consuming, but really adds to the depth of the finished drawing.
3) I use a very sharp point when doing the details. This lets me produce razor sharp edges and darker values in small areas (eyes). I don't think you can achieve that degree of sharpness with .07 lead. I use mechanical lead holders (drafting pencils)with drafting leads, sharpened with a lead pointer.
4) Kneaded rubber is as essential to me as my pencil.
Bill