Create a high-resolution, photorealistic image of a serene coastal landscape at dawn. The scene should capture the tranquil beauty of a sandy beach with gentle waves lapping at the shore. The sky is painted in soft pastel hues of pink, orange, and purple as the sun begins to rise. In the foreground, smooth pebbles and seashells are scattered along the sand, glistening in the early morning light. A lone seagull soars gracefully above the water, adding a sense of freedom and movement. In the distance, rugged cliffs rise majestically, partially shrouded in morning mist. The overall image should evoke a sense of peace, natural beauty, and the refreshing calm of a new day by the sea.