The inside of the structures needed to have a different color to indicate a different material.

The Viewport (or 3DView as I prefer) can have different colors assigned. It can help you see, to a very limited degree imo, the overall look your scene may have when completed.
   While the branches of the ivies have been completed, the leaves are just at the starting point. While preparing for this tutorial I had created three leaves in testing, but found that one in particular suited this tutorial ideally, due to it's simplicity in design and creation, but, that creation still has to be done. Let me put it this way, HE already told me how to do it, I just need to go do it, lol.

Anywho, have a great one!!

Thank YOU!!!!!!!