Longfellow chose that particular scene as a powerful image to convey his grief because he believed that his situation could be related to a darker side of nature. Natural scenes always give people different feelings. For example, a sunny day makes people happy and a rainy day usually makes people depressing. Longfellow related his feeling to a scene that could be used to explain his grief. In “The Cross of Snow”, the cross on the mountain makes him feel the same way about a deep cut in his heart. Basically, he transformed the feeling inside him to something that we can see.
If I were to describe a feeling of grief, I would use the withering of trees. (It would be better to have the setting at the beginning of winter, when everything starts seem to lose life and energy.) As the leaves fall, it represents a feeling of losing hope. It also feels like a heartbroken scene, which the leaves can be described as the broken pieces. The coming of winter symbolizes the tough situation that one is facing. The tree was supposed to be strong but now it is falling apart. It can be used to describe a feeling that everything is going to an end.