Thanks! That's very kind on your side. A safest bet for me would be to put the 5'th of June as a deadline for Ancalagon: I'm having a scientific conference soon and alot of work to do so it's likely that I won't be able to work on him for more that a couple of evenings untill the end of May, and I don't feel like presenting a rushed work. Maybe I'll be able to get him done much sooner than the end of May but I can't firmly guarantee that.
As for the pencil versions, my technique for this is the following: I draw an initial pencil sketch, then scan it and add all the color and color-related details in GIMP. I'd like to add background to the initial sketch and have it as a stand-alone b/w piece.
P. S. uploaded a larger-resolution image for Glaurung (4400x1900) just in case.