Before and after watching the demo videos. I felt like I still struggled somewhat with the shadows and light approach even after watching the demo.

Sketches before (first three) and after (second three) watching the demo video. I found I drew more freely after switching to a slightly softer pencil (from HB to B).

First two drawings are prior to watching the demo, and the second two are after. I feel like the second two are somewhat messier, but I was able to draw faster using the method in the demo. (Also, apologies if the lines are rather light and hard to see.)

My attempts to draw a simplified version of the pear. The first drawing is from before I watched the demo video, and the second drawing is from after watching. (Note: The second drawing uses a different reference image than the first.)