"Construct a thumbnail illustrating the power of conversation in mental health, using a photorealistic image of two people in silhouette, facing each other in a serene setting, perhaps with a sunset or calm sea behind them. This should highlight the importance of communication and support in mental wellness, with the serene background emphasizing a safe and peaceful space for sharing and understanding. The image should focus on the connection between the individuals, with realistic lighting enhancing the mood of openness and warmth, chaos, 4k --ar 16:9 --niji 6