3. Add Trees and Background
Sketch five trees in front of the middle buildings using squiggly half circles around the top railing. Evenly space pairs of vertical lines on the sides of some of the buildings, as shown.
Use diagonal lines on the sides of the two tall middle buildings to continue the bands. Draw a few more buildings in the background. Give the tall narrow building on the left a second side using parallel lines connected to the front with diagonal lines. Complete the roof using two triangles.