Thank you very much for the answers! even though I didn't answer before (mainly because I'm in the middle of the forest and I only get Internet access when I visit my friends) they have been of much use. So, first of all i'll explain a bit better the problem and where I am now. The drawings I'm tryi...

Good morning, I've been using Inkscape for a while but I still have a lot to learn so sorry if my question is a bit stupid. Basically I'm trying to get an effect similar to the shading you get with charcoal which you can see very cleraly in this image (sorry I didn't know how to make images smaller)...