15 year old boy on a mountain

A 15-year-old boy with brown hair sits on a mountain, with space visible in the background and surrounding mountains. The scene should look dreamlike, with detailed descriptions that convey a sense of wonder and awe. The environment features woods, a river, and a desert below the mountain. The mood of the scene is joyful and happy, with the Milky Way visible in the sky. The prompt should be realized from the back of the boy, with his face obscured from view.