Asher B. Durand, drawing courtesy of artrenewal.org. Here is a a post I wrote about Durand. In the incisive drawings above you can see a phenomenon I would like to draw your attention to this evening, that of inward facing "V" shapes around the limbs of trees.
Here is our trusty field tree again with some lines drawn on it,
What I am talkng about is negative shapes. You know about those. They are the parts of the universe that remain after what you are drawing has been removed. They are very important in getting the parts of a drawing correct. There is lots to be said about them too. But tonight I will confine myself to pointing out their role in drawing trees.
These "V"s are the opposite, and the result of, the forking of the branches as they leave the trunk and then subdivide continually on their way to the light. The positive shape is a fork, the negative shape is a "V". Arrange those "V"s right, and you will have half of the job of defining the limbs of a tree done. I like to move back and forth between drawing the positive and negative forms when drawing trees.