I added a couple of younger maple trees to the right of the larger trees by the entryway to the lower field.
Next I put in a few very small saplings to the right of the young trees.

I wanted to add a little more depth to the drawing so I started with the distant fence by the treeline which is the start of 60 acres (24.3 hectares) of class 1 through 3 wetland and mixed forest which makes up the southern boundary of the farm.
I will post this drawing again at a later date once I have more of the tree lined boundary fences finished.