Well it's full of imagery: personification,simile, some alliteration. The mood is elegaic, you might say, mourning the passing year but there is a splendid sense of colour. There is a clever use of caesura and repetition in the fifth line to enhance the sense of leaves falling periodically and continually. It's a nice piece of description. I'd not want to dismantle a poem like this too far as it's about the senses and their reception of experience.The image of the trees as of women undressing is obviously sensual. The unusual word 'mumming' or miming is worth examining but I'll stop there.
Think of it as a photograph