Here’s my first attempt. I did the penguin first, then realized i was being way too tense so i tried to loosen up a lot on the others and leave more bad lines unless I made them too dark and distracting.

Here’s my drawings before and after the demonstration. Any tips on how to keep my pencil marks visible and organized all the way through like in the demo would be greatly appreciated. I also found it very hard to stay light enough with the HB to keep the midtones distinct from each other and to keep the dark midtone distinct from the shadows.