Lisa Chellman posted about a comics workshop she attended at her library (lucky!). It featured someone talking about the process of writing comics, and as I read her notes, I thought, "My, my, how intriguing! This is certainly something to keep in mind as I read graphic novels!" (Apparently my inner thoughts are those of a grandma. Next, I will bake mental cookies.)
Now, current graphic novels have diverged from the kind of 22-page comic books that this guy writes, but many of the things he says regarding the storytelling (dialogue-wise and artistically) still have weight in GNs. Go take a look.