Observational drawing is one of my favoruite drawing techniques to teach. I find students improve their drawing skills so much faster when they learn how to draw from direct observation. It forces them to slow down and really take their time.
This is a class I ran for Grade 4,5 and 6 students. I introduced them to basic drawing tools (4B pencil, blender, kneadable erasers). I showed them how to light their objects (we just sit by a window and turn off all the lights in the classroom). Looking at the shadows and the cast shadow. We place the objects on a sheet of white paper so you can see the shadows and value changes easier.
I used three objects that I could buy at the Dollar store: marshmallows (cylinder), snack cakes (rectangular prism) and Werther's Original candies (kinda sphere-ey).
Here are some of the results!
Werther's Original candies: