I was always under the impression that it is hard to get grey lines with a black inking pen[/b]
There's a few ways you can shade it, and depending on your pen, sometimes it is possible to shade with just that. I don't think there's very many pens that can't be used to shade, it'll just be a little bit trickier with some. I dunno, somehow I've found ways to shade with them just like with using a pencil. Or you could do what I did and just add to it on the computer.
Here's a couple pictures I've drawn with a pen and still got shading in there and these haven't been edited by a computer:


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