I think that this captures the fleeting immediacy of the moment really well.

Nice to see spontaneous sketches posted here.

I enjoy ability to make such fast sketches!
I am not well trained myself on this.

I’ll try to sketch after printed photos in a first time, before facing a live moving subject.

My father was good sketcher. He was architect and used sketches much more than photographs for keeping in mind details! Of course, he learned this at the time where photos were difficult, expansive and time consuming. With sketches, he could go to the site in the morning and be able to use them for his work in the same afternoon. With photos, he had to give the film to the photo lab and take the photos back several days later, sometimes even a week later. When I learned to develop and print photos my self, I could give him the photos next day or even the same evening, however he never lost the sketch skill!

Now, digital photos make it so easy, so I’m afraid that new generations of architects are less skilled in that.