I visited Castle Rock in Edinburgh when I was 19 and was living and working in Scotland for a few months. This drawing is inspired by the idea of a castle on a rock and is a digital version of a sketch I made in that period. It always fascinated me to think about our planet as just a tiny rock floating in space. Placing a castle on it seemed the obvious thing to do. My 8 year old son thought the fish were a nice addition.
Video of drawing process: