The hardest stuff to sketch is something that happens only once and for not very long at all. Like this truck stopping in front of my house to deliver some chairs for the backyard. You’d think it takes a while to unload a big box of chairs. Nope.
A quick continuous line drawing is all I caught from the front window before the truck was gone. Thank goodness my sketchbook is always with me!
I added the color immediately after from mental notes made as soon as I realized I wasn’t going to be able to get very far. Looking back, I’m not sure the sketch needed color.
Edit: In answer to a question about coloring in the sketch with my source gone.
I colored this in AS SOON as I had sketched, it, but without the men and truck there of course, they left. I did make mental notes and the light wasn’t particularly interesting, so I didn’t not anything about shadows.
If I had more time, but wasn’t going to color right then, I would have made more notes, of color and light and shade, like this :