Exercise - perspective in the front hallway

This was a quick pencil sketch of my front hallway, which has lots of items (pictures, doorways, rugs) leading to a front door with two glazed panels.

It was a dull day outside, but still the contrast of light from outside created strong lines around the door. I didn't use a ruler for any of the straight lines, and I also didn't create a horizon to get the perspective right.

So it was all done from eye. By using a horizon and getting the parallel lines to meet on the line, I'd have got a more accurate image... but this was just a starter.