In art, especially in paintings and drawings that include colors, and aim at representing a reality it is common the water from rivers, lakes, etc. and sky have a similar hue as they are both represented as blue. This occurs because we perceive both elements as blue, and also because the color of the sky is often reflected on water, which s depicted by the artist. This does not apply in abstract art and other forms of art that do not represent elements realistically. This implies it is likely the part of the drawing that will closely match the hue of the sky is the river as Jessie might use the same hue of blue for both.
