hey, dont fret the lines. they do take a lot of time and patience tho. to get those whooshy art student like figure drawings you'll have to master drawing ellipses. and a lot of those are done on massive newsprint pads... not a sketch book, and it takes a considerable amount of talent to replicate that on a smaller scale. To draw them the person moves thier whole shoulder and swings it around drawing the ellipse in the air above the paper and then wen they think they have the right ellipse they drop down the charcoal. to get those whooshy lines u'll have to learn to manipulate and draw fractions of ellipses. then wen confidence builds u can practice "s" curves etc. and work them into ur drawing strategies. If you like I could divulge more ideas. But I wont waste ur time any longer. just be patient and give it time. great stuff. keep working at it and you'll get there.