There may be some extra JPEG compression taking away some detail. I noticed some compression artifacts on the handle and the bucket. Your file size is only 36k and you could have used up to 150k for this challenge. Compression kills detail. Always use the least compression you can get away with and still come in under challenge limits.
Well... This a good photo in every technical aspect, so that and that it meets the challenge very well earns a decent score. However, I don't "gain" anything from this photo, so it stops with a 6 from me.