I recently sold an oil painting I did in Brooklyn back in 1986. I had a loft space with a view of Brooklyn looking towards downtown Manhattan which included the towers of the World Trade Center in the skyline. The painting has been displayed in my home often over the years- I have always enjoyed it. The patron to whom it now belongs was captivated by it when visiting recently, and the sale ensued.
I post here an earlier sketch done on a 9×12 inch canvas to elucidate the process of going from small to larger, from the raw sketch to a more complex composition.

New York from Brooklyn, oil on canvas, 23x31 cm, 1986.

The 9×12 inch sketch, above, featuring the World Trade Towers in the skyline.

The larger painting, below, still has the twin towers but they are lighter, more atmospheric.

Lower Manhattan from Brooklyn, oil on canvas, 41x71 cm, 1986. Private Collection.