Mood: The mood of this image is festive and celebratory, capturing the excitement and joy of welcoming a new year. The theme appears to be a New Year's celebration, as indicated by the text 'Welcome 2018'.

Environment: The environment appears to be a lively and vibrant party setting, likely a nightclub or event space with colorful lights and decorations. The presence of a crowd in the background suggests a crowded and energetic atmosphere.