I recalled these being done in 2017 while practicing for MAGES' Imagenius' contest back in 2017.
Mr. Zaki Ragman was the instructor at the time and I just basically inserted myself into the class because I was quite an excitable kid back then. Wish I knew a lot about restraint tho as well back then. >_<
Here's a little practice on perspective of 2 points and 3 points.