Thanks 
do you mean this river?
I did that just a couple months ago if so
Umm… faffing around, more or less 
truth be told, I don’t really have a specialization other than “stylized” (I just can’t get myself to care about realism.) since I’m a pure hobbyist, I have the luxury of being able to do whatever I want without having to drill down into one specific skill set. That being said, I do still have a lot of learning and growing to do. If you’d like to see more recent progress, check out this thread: 99* Days of Blender
That’s an excellent question. If I still had the file, I would share it with you. I’ll check my archives again but I don’t think I do. It’s mostly just shader trickery- color ramps set to constant, outlines with the inverted hull method, etc. I don’t remember beyond that, sorry