Hi guys, thanks so much for your comments! Caleb and Carl, believe me, I used all kinds of 5B and 6B! ;) The drawing is, in fact, darker than what it appears to be in this photo. The reflection from the scan has given it a light overcast, an issue that I haven't quite been able to get around yet. This photo here:
http://tinyurl.com/p8jsxc2
is a much more accurate depiction of the real color. Regrettably I was in a hurry when entering, and didn't use the the correct picture.