Very often we have something in a room or that we would like to put in a room that can help us to choose the colors for that room. In this case this picture set the overall mood & guide to the color scheme.
Monochrome dark blue color palette reminds of mystery of the sky before a thunderstorm. Transition from deep dark blue color to pure white is contrast and at the same time softened with pastel shades of blue. Perfect color for the interior of bathroom