I would color this piece to capture the emotional look of Leila's expression and draw attention to the details of the painting. Her hair is a deep black, that I would fill in with a deep charcoal or ebony color and use lighter and dark shades for depth. The sky in this painting would be a soft blue for the day and a dark navy for the night. The harbor water would be filled in with a deep blue and turquoise, while the shadows of the people are a deep navy to represent the twilight and vastness of the sea. The ship should be a bright white, and the sails filled in with a light blue or white for a crisp, clean look. The railing Leila is leaning on would be a warm bronze or gold to bring a pop of color to the piece. Finally, I would use cooler colors such as gray and pink to portray the melancholy atmosphere.