First I tidied up my sketch adding a few more details to the branches.

From there I added the branches, once again from the top and worked my way down the tree trunk.
Next I added the pine needles onto each of the branches.
I gradually thickened the tree trunk, as I approached the bottom and filled in a few small broken branches coming off from the trunk.
Lastly I indicated the ground line by adding in some grasses and growies.
When matted and shrink wrapped, this original 4" x 9” pen and ink drawing will be available for $45.00.