This is my first post on blenderartist! I am working on a free-to-read graphic novel since a few months. Basically I use Blender for modelling and rendering (with the NPR) then I use 2D tools for the post-production and the colorization (not open source tools, unfortunately, but I am working on it :-)).
Thanks for your feedback!
You can read the prologue and the first chapter on http://steppenwolf.fr