One perspective drawing

I found the art community ConceptArt.org Through that forum I came across some videos created by Massive Black on one perspective drawing. After buying, downloading the CD's and watching the instructions. I did my best to set up a correct environment for one perspective drawing. This is how that look. Iv yet to use it for anything. As I have more then enough with practicing far less complicated things then perspective drawing. When the problem lies in drawing circles and lines. Perspective isn't what you need.