Just as we did with the top of the tree, we can now draw the indication of leaves in the highlighted areas on the left side of the tree. First, choose one cluster shape and erase the light border guideline along the edge. The arrow in the image below shows where there used to be a guideline that is now erased.

Next, use an HB pencil to lightly sketch some short markings where the guideline used to be. Draw some of these short leaf markings in the highlighted area of the cluster too.

Begin doing the same thing in other clusters on the left side of the tree. Draw leaves in the lighter areas of each cluster. If you have a narrow gap between the top section and left section of the tree, you can draw some leaves there as well to fill the gap and make the canopy look whole.

Remember, as you get to the clusters along the left edge of the tree, erase the guidelines so they will no longer show in the final drawing. Additionally, draw leaves that extend beyond the edge of the canopy of the tree.

Stay steady, patient, and consistent with your markings until you have leaves showing in all of the highlighted areas of the left side of the tree.