At the background of high azure sky and snow-white clouds we can see swans flying over the dark blue sea.
There is a ship under full sail adding to romantic character of the dark stormy sea.
The swans' flight is free and easy as if they swim in light transparent air.
The outline of the clouds over the horizon emphasizes the birds' flight direction.
Swans seem to move towards the sailing ship and go back ( over snow-covered rocks) to the right corner of the canvas.