A redraw of a piece I did in 2001 - I still love the movie with all my heart.
Many of the pieces from this gallery are available as prints through ghostfire.net or specifically at the ghostfire market.
I did read the book, although I saw the movie when I was around six years old, and didn't read the book until I was in my 20s. I think they did a very good job figuring out the elements from the written story that translated best into the visual medium, but I agree that the book does add a lot more depth.
I had it the same with movie and the book! I saw the movie few times as a child and teen and noticed it was based on the book so searched for the book since then, though I actually couldn't read it earlier because it wasn't published in our country before the end of 90's (and I didn't buy online from abroad at the time. Well, we hardly learned about internet at the time).
Anyway, like you said - very good job with adaptation (actually one of the few book adaptations into the movie that I really like and think about it as a good one) but book is book, that is always more (at least for me) :)