I have always liked the Flex, but wife doesn't so minivan it is. 20" is too big for a car like that, no one thinks you are in Fast n Furious anyway and more rubber is much better for crappy roads.
I think the picture could be taken a little higher so you can see both the actual top of the trees and their reflections. Otherwise it looks good! Keep in mind I don't know the first thing about photography, just my own impression.