This painting was done from a photograph: "Some artists have an idea that it is unethical to paint watercolors from photographs. However, a photograph represents nothing more than a record of an actual scene. If the artist exercises the same care in composing his painting from a photo that he would have used if painting from the subject itself, the finished painting should be equally acceptable".
Frederic Whitaker,"Whitaker on Watercolor", Van Nostrand Reinhold, New York, 1963.