Hey there, Peach! I'm here with an SSCC Charity Review.
So first off I'm really glad this is a poem--I really don't read enough poetry, and ever since taking a Poetry/Fiction Creative Writing class last semester, and a Poetry CW class this semester, I've been meaning to.
I really do love Autumn. Not so much where I live (our "Fall" happens during our "Winter" and we get no Winter =P), but it's still probably my favorite season. My favorite part being the colder weather, most likely. Though on that note, the "Colder weather" line of the poem seemed just a little off to me--specifically the "colder." I think perhaps something like "crisp" would work better. Maybe not that word specifically, but I think a single-syllable word would sound better.
On the note of sound, you really do a good job here. I really liked the alliteration and similar sounds used throughout (especially the "s" sounds, it seems to fit with the "peaceful" setting of Autumn portrayed here).
One small structuring nitpick, I feel like "Summer leaves/Fallen" should be switched. Not only because I think "fallen summer leaves" sounds better than the reverse, but mostly because that way it gives the poem a nice look--all lines being roughly the same length, with the exception of the very first and the very last, being single words. Maybe it's just me, but I think the only single-word lines being the first and last would be powerful, also considering the two words--"Fallen" and "Autumn" really go well together.
Other than that, I don't really have a lot more to say. The poem flowed nicely and I really enjoyed this--a beautiful poem for a beautiful season. Well-done! Keep writing poetry. 
