So I used to take this course in college called drawing on location. You would go to a public place and draw for three hours on 14x20 paper using charcoal. It was all about composition and finding pattern and shape, more so than I'd say perspective. It was awesome and definitely shaped a lot of opinions I had with approach. Later on after college I took some perspective lessons from a friend who was an architect and did some location drawings basing my observations on more or a deconstructed approach. This is kinda a marriage of both. It's the fountain at Madison Square park and was done in a very small sketch books using s fine tip sharpie, a regular sharpie, a gray crayola washable marker (I love these things!) and a copec warm gray marker (which is AMAZING!)_ More life drawings/sketches to come.