Taking ideas from pics and stuff Ive seen on the street.
Something I noticed upon coming to Japan is that when drawing with HB lead, it seems to almost turn to 2H (lighter lead) when its humid. Most likely because of the paper. This throws me off since it was always dry in Southern California. But yea, when its humid, I find I have to press harder.
As with digital sketches, I keep the initial roughs really light then proceed to darken once I have something I like.