The area with a Red dotted line around it, further downstream towards the top and left of photo, proved easier to restore. In that region, look closely and you might see the grey trunks are willow and dogwood trees, now nearly 8-10 feet tall, which started off as bare-stick "live stake cuttings". In addition, there is a nice dense understory of mosses, grasses, sedges, and wildflowers that has developed and diversified over time. Overall, that part of the stream bank indeed became fully vegetated and has remained quite stable since 2014, despite retaining the original steep 4' tall slope profile which was never altered.
The area enclosed in the Turquoise dotted line initially received the exact same treatment, twice in 2 failed attempts; I eventually realized that because it was both even steeper yet and also shadier than the region in red, it needed a different approach. By the time I had come up with a better plan for the turquoise zone, it's state had devolved from barren nearly vertical, to a concave profile with an unsupported overhanging top as illustrated in the photo below. (Hopefully that will indeed be it's final "before" stage of a thriving restoration.) The difference employed this time was creation of a series of tiny stair-stepped terraces to modify the slope, the first one is visible below in mid-installation: as a dark brown board at toe of slope held by wooden stakes.
use to create miniature terraces with. Then I used a machete to cut off the overhanging top of the bank which had no underlying support. The soil from that filled up the miniature terraces created by the boards.
From there, the process was similar to that I'd used previously -- I tacked down a 4 foot wide woven jute mat along the streambank. Then installed "live stake cuttings" of various willow and dogwood species which will grow into trees. Then I spread a variety of seeds, and also transplanted some local native plants within the protection of the jute mat, and in this case, within the terraces as well. That was about 6 weeks ago now. The photo here shows the new growth as of yesterday.