I've made a whole lot of progress and overall I'm pretty satisfied with how its going. I think it looks pretty nice, and in some places Dürer's mark really comes through.
However, there are certainly parts that I'm very unhappy with. I think I really messed up on my arm. The mark I have there really looks nothing like Dürer's, so I'm definitely going to go back and see if I can make it better somehow. I made the back of the nose curve back toward the front much more than I initially intended to, however, there's not a lot I can do about that now.
Another area that I'm having difficulty with is the hair. My hair is a lot longer than the hair in Dürer's drawing, which makes it a lot harder to copy the mark. The hair in Dürer's work has a lot of curve to it, which mine really can't do as it just falls straight down.
I am extremely happy with the ear however. I think not only does it look pretty good, but I think I did a good job of copying Dürer's mark. That's probably my favorite part of this piece for the moment.