Appreciate:
From the perspective of "scenery", the selected scenery such as "night rain, flute sound, fallen leaves and west wind" has the characteristics of sadness and desolation, which constitutes a sad and gloomy artistic conception, in line with the author's sad thought.
From the perspective of "emotion", the author's inner sadness is skillfully integrated into the description of the scenery, and the action of "hiding the door alone" highlights the sense of loneliness. The two poems blend scenes, and their visual and auditory images have a distinct sense of image and appeal.
Satisfied, please adopt!