Your printer must do nicer blacks than mine. It just doesn't do a dark enough black line for my liking, and then any additional color on top of that seems to wash it out. Baaaaaaaaaaah on my printer!!!!
What parts of the process are digital and what are traditional for you?
Do you have a laser printer or inkjet? That might do the difference. Mine manages to do really nice and dark blacks, so I guess I got lucjy with mine :'D
the sketch and the linework is traditional, after that I edit it a lot and color it.