Colorado David
Explorer
I like your treatment of the background and I know the subject of the photo is the bumper, but using the black background at ground level muddles up some of the detail under the vehicle. I know the focus should be on the bumper, but my eye is drawn to the area beneath the vehicle trying to find some detail. I believe if there were a gradient to a lighter background in the lower third, the viewer would look there and then focus more on the bumper. I like your choice of color for the upper left background as it is repeated in the highlight just to the right of the driver's side headlight.