The study below was a bare tree along a river bank. I couldn't get further away so did part of the tree. It was difficult to differentiate the smaller branches and twigs of which there were may. But I think eventually I achieved something of the nature of the tree.
I found that to study an entire tree in detail was not easy with large trees, as I had to get far enough away to see the entire tree, its shape and the nature of its branches and foliage. Yet being far enough away it would often be difficult to see the detail clearly enough. I therefore chose a medium size tree to do in its entirety. I chose to use conte crayons as I felt it would enable me to work reasonably quickly and although it did I was very much slowed down by trying to get a sense of the detail of the tree, particulary the foliage.