I'd darken the image a bit. The sky is washed out and the grass at the bottom is a bit too bright. The one big thing I'd say though - wait until no one is visible in the reflection. I've gone to quite a few car shows over the years, and I know the window of opportunity can be only a second or two, but the difference is well worth it. I've also never been threatened when I've asked someone to simply step back for a moment. Just my two cents.
Just wanted to see if I got this right OK I can now post thanks for the help. Thats all I was trying to do. And Yes I need to get people out of the way and do a little photoshop retouching.......Thanks for the input.