Mood: The mood of the video appears to be playful, romantic, and carefree. The theme seems to revolve around love, relationships, or fantasy, given the mermaid costume and the serene natural setting. The overall emotion evoked is lighthearted and dreamy.

Environment: The setting of the video seems to be a picturesque, natural environment, possibly a garden or a pond with artificial rock formations, lotus flowers, and sunflowers. The presence of a mermaid tail suggests a whimsical or fantasy element to the video.