I enjoyed doing this drawing with a drawing pen. I drew over two days and the first day was overcast while the second was sunny. The drawing on an overcast day was almost in silhouette. The bright grey sky and lack of direct sunlight made any tone or texture difficult to see. In contrast, on the sunny day with the sun falling from the left the trunk and branches were much more clearly defined.
The instructions were to spend an hour on the drawing but I probably spent at least 3. It felt like I was doing a portrait of an individual tree so I wanted to get each branch right.