I love abstract.. and this is a very nice example of one.. it is missing a few colors that exist in a rainbow and that might hurt your score... well photographed!
this is about the only cool result of leaks in a car...the lighting is a bit harsh so it is actually a little hard to pick up the rainbow in this one - perhaps a lower angle as opposed to straight down would work better under these lighting conditions
Interesting idea but a bit lacking overall. I think maybe if you had poured some water on it to get the rainbow in from the oil and water rather than just the oil and pavement you may have had a stronger image. As is though a bit flat as an image.