What things usually get changed when taking a novel you've written, and turning it into a graphic novel script? It seems like I remember a guy at a comic shop telling me how something like a 50,000 word novel would be trimmed down to something like a 32,000 word novel, and then spread across 8 different 108 page volumes because comic audiences wouldn't read something as long as a regular prose novel within the graphic novel community.
Not sure if this guy has read any of the graphic novels I have though, as sometimes those can be as many as 300 pages. Although Japanese manga I've written tends to not have as much going on page per page as a lot of Western comics seems to. (Kingdom Come comes to mind specifically.)
Although if the guy is write, one of my works seems like it be reaching the long end for a graphic novel. (At around 23,000 words.)
Plus I'm not really sure how my current writing would adapt, as I tend to write in an abstract (in the MCs mind) kind of fashion. It's difficult even adapting it into a game, and I've watched lets plays of some really abstract games.