These are drawings that we had to make in class. The assignments was to draw perspective. We had to try out birds eye perspective, perspective from eye level and frog perspective. The latter had a different name in class though. 

As a kid I had a 'How to draw perspective' book. Most I loved drawing perspective and I guess some of it never got lost. Seeing the photos of my drawings I do see some perspective errors, but as our assigner explained, drawing a lot of perspective will teach you how to see it quicker. After a lot of practice, drawing perspective will become a second nature. I do believe that the drawing book that I had as a 7 year old gives me some advantage.