A limited palette study from your sketches
For this work I went back to the view from the back window. I understood that this exercise required me to choose a sketch to develop primarily using colour. So I used the pen and ink sketch to determine the verticals of the primary focus and some of the other lines around that and then I started working with water-soluble pencils to build the detail. I didn't really stick to the principle of a limited palette but used the pencils to describe the different colours and tones, particularly with the trees. I then gave it a touch of a water wash in areas to deepen the colours.