I learned about perspective and vanishing points studying graphic drawing at school and have a good understanding of the concept. I also learned from my A-level Art teacher how to capture angles with a pencil or brush to translate onto the page, and measure relative proportions in the same way.

It is interesting that most of my perspective lines do meet, but below where I estimated my eye level to be.  The recessed panels in the doors are aligned which suggests that my estimation of eye level is correct….  I just stood next to the door and confirmed this to be the case. Curious. Having said that, I can see that re-drawing using a point on my eye level (blue) makes very little difference. I think the distant door is slightly too wide and this pulls the vanishing point down.

Let’s ignore the rug!