
I've shared my technique and workflow on digital comic creation with MyPaint and Inkscape here:
http://harishankar.org/blog/entry.php/w ... e-software
In the above tutorial I cover the workflow from:
1. Pencils and inks
2. Vectorization
3. Colouring and shading
4. Speech bubbles and final export
Hope it's beneficial to comic creators and digital artists.