Score: 8
"Incomplete perspective tutorial"
date: April 4, 2006
You are missing the last part of single point perspective, the grid. The grid is sometimes a very helpful tool in helping to layout objects in the space. But i suppose there is no real way to tell you so try doing a search on Alberti's perspective construction. Also you might want do some research on alternative perspective construction methods such as three, four, five and even six point perspectives. (Yes, they do exist and I'm not just making this up.)