Forgot to add something aobut the confidence in line - it's really hard t explain, as you've seen, but it one of those things that you just tell is teh mark of a pro.

Part of it is the physical act of drawing - the amateur draws slowly, with a bit of hesitation, because he is consciously calculating where the pen is going and trying to get it to follow the pencil line it's tracing. The pro lays the inks down smoothly, with no hesitation, because she has done it so much know kows where the pen nib is going without needed to watch it closely - she's actually drawing with the ink, instead of tracing, like the amateur. Moving the pen slowly leaves more ink because the paper has more time to suck up ink, so it gets a bit oversaturated and the ink spreads out - so you get the hesitaiton caused by lots of little course corrections, for want of a better word, as the line is carefully, slowly, drawn, and the ink spreads out and gets fuzzy because the paper is oversaturated. Fast lines don't do that - the pro knows exactly where the line is going and is leaving just exactly enough ink on the page so it doesn't spread out.