When I teach drawing, one of the first 5 topics includes: how to draw anything in perspective and tips to help capture the difference between mechanical looking (man made) objects versus organic objects. Understanding ellipses in perspective is useful when capturing man made objects such as a thrown vessel, bottles, pipes etc.
I just happened across this very useful post about drawing ellipses. Click below to see a clear and simple description of how to render ellipses in perspective.
This is a nice review of what we've covered in class.