I had a heck of a time with the negative space drawing - gave up. However, I did use the proportion info when doing this one upside down. It didn't look great upside down but right side up = OK. Maybe I'll try the negative drawing using the proportion idea. The feet really surprised me.
Never heard of this. First art class - I read through the other replies and said umm - umm to all of the comments. Flower, et all are really hysterical. This requires more attention for sure.
It is easier as the subject remains stationary.
Feathers and shadings are a challenge with a pencil. Closer look brings the tree branch details - the lichen and moss. The absolute black eye. Leg angles -
Nature journaling requires these details.