Winter, but it's a tough call because they're all pretty awesome. I didn't choose "all of them!" because, at the end of the day, I still have a favorite.
I personally like fire, but I think that the Spring dragon just looks so detailed and, well, for nature lovers, that is the best one, even though I like the rest A LOT, I just HAVE to go for the spring dragon. I think even from a distance it looks like the most complicated of the four and it just seems to stand out for me.
Devious Comments
so i went with my fav when compared side-by-side: the autumn one. gotta love the decaying look of it~