Quick sketch of a real castle in St Malo, France, and a photograph of it, for comparison ;)

Bridge in the mountains.
(from the green book)

Overhead view of guy in tower looking down at horse-drawn carriage across moat.
(from the green book)

Castle on a cliff.
(from the green book)

 
This is a castle I planned out over the period of a few egregiously long English class periods in high school.
If you’d like to know more about the story that went along with it, just click on the pics above.

Castle seen from overhead. The shading is pretty neat, if not very consistent :)

Castle tower on a bit of scrap paper

  
A few castle sketches on lined paper.

Pointillist castle on a large piece of paper.