You found some nice bright colors for us to enjoy in this image. And it is well exposed with good sharpness throughout.
Unfortunately the composition of this fun shot does suffer a bit, and the reasons have been well enumerated in your comments during competition. In this Planes/trains/Autos Challenge it seemed wise to concentrate on getting the most out of one vehicle and so the large amount of foreground blue was a distraction, and of course, the guy washing the car was perhaps more the subject than the partial van. our voters can be very literal (as we have all discovered upon occasion) and it looks as if your image suffered from this trait.
When I looked at some of your other images it was obvious that you have a good eye and a good sense of humor so I look forward to the next of your entries.
I like colours but the composition grates for me. Perhaps shot from a different angle rather than pretty much putting the fellow almost in the middle of the shot would make it a more interesting photo
It may be true that you took this picture on the person's prom day, but there is nothing in the photo that gives a hint of this to the viewer. So here the title doesn't add anything to the picture. It's a good picture in that it has good color and saturation and it's in focus, but there is nothing interesting about the composition. There was no interesting point of view, no leading lines, no stop action of a water splash, no motion blur of people having a water fight. So I don't want to be harsh in my criticism, but here is an example of a good and average picture.