I've been asked a couple of time howdo I ink my comic tables (don't laugh, it is true, damnit!).

I scanned one of the next ones half-way to be finished. I ink with a black biro pen, directly over the pencil, that I erase away after (always wait at least 15 minutes that everything is dry, if you don't want to smear the ink), contour first. then I proceed to cross hatch to define shadows and cover anatomy and perspective errors.