I discovered I really needed to have a much better understanding of perspective while taking an anatomy drawing class online. Turns out, good proportion, solid shape language, and accurate foreshortening all require a pretty decent knowledge of perspective - which pretty much encompasses any type artwork out there. 

As I thought about it, I realized that I had always struggled to create shapes in perspective. Finding the information I needed to get better at perspective was not easy. Most of the information I found in books and online seemed to be intended for the intuitive artist - someone who already draws what they see in their mind. I needed a more mechanical approach - a method that provides a process for achieving accurate perspective. 

I researched many methods for drawing in perspective over the course of several months. I was only gaining small bits of knowledge about how to create objects in perspective while I was becoming increasingly aware; as long as command of perspective eluded me, it would prevent me from being a capable artist. I became obsessed with the idea a process based method had to exist somewhere.

More info - https://www.skillshare.com/classes/design/Get-Better-at-Perspective-Drawing-Beginning-with-the-Basics-using-Affinity-Designer/1211746611