@Toast: Thank you =) I used some very thick paper with smooth texture. I don't know what it's called, or even where I got it from, it has been hidden away among my art supplies for quite some time I suspect.

@Scarlet: Derwent Inktense, watersoluble ink pencils. They are quite neat, they can be used in many different ways. I used to use them a lot for thumbnails for poster layouts, but they seems to be even better for this kind of stuff.