#42: One of the biggest things to get your head around with clothing folds that I'm starting to realise is that you can't draw the picture and then add lines over the top of it. Looks dumb, doesn't work. You've got to make the lines change the shape of the picture. Draw the outline of the figure, and then draw the fold lines on a different layer, but have them cross the outline and change it's shape. That's what my process at the moment is, anyway.
#43: I don't get this either, you're on your own.