I've been gone for a little while. It was a bit bananas with work stretching sometimes to nearly 11-12 hour days later last year. And I had to prioritize finishing the Horticulture course, which has been pretty useful. All better now, So I am hoping to continue where things left off.
I continued with Sam Smiths Assignments. And am putting together some things with Rhino and Zbrush.
I think Form does help with the Lighting course but they complement each other.
Sam Smith Sunny Day Lighting Part 1 and 2
I have started importing rhino models into Zbrush, rather than the other way. Seems okay with high poly counts. When i started with Rhino 3 long ago the computer would often crash with high polys. Rhino 7 is a bit friendlier. I think the Zbrush model may be much quicker and neater to build with primitives especially spheres, though have committed to a rough base long ago with the experience I had then.