Drawing 1-, 2-, and 3-Point Perspective (Interior)

My post on drawing in perspective is still wildly popular. So much so that I even took that knowledge and used it for my setting studies. However, I ended up learning that exterior perspective is a little different from interior perspective. With some research, I set the record straight. And now, I’m sharing that little secret with you. ;)
Drawing 1-, 2-, and 3-Point Perspective (Exterior)

As I’m sketching backdrops for books, I’m learning more about how to draw in perspective. And it’s not easy. The amount of double-checking angles and marking points is as irritating as doing research for a book or rewriting one.
Regardless, I love being able to create realistic dimensions and proper shapes. That takes some understanding of perspective though, which is why I gathered all my sources and am breaking down the elements of 1-, 2-, and 3- point perspective and how to draw within those parameters.