游客从后面欣赏彩键背景上的景色 Tourist from behind appreciating the view on a chroma key background

男孩背着一个绿色背景的背包，惊叹于这片风景，同时把手放在额头上遮挡自己。

Boy on his back with a backpack on a green background, marveling at the landscape, while putting his hand to his forehead to shade himself in view.