I'm pretty sure my grandpa has a picture of this same truck... how neat! I think that a different POV and a different composition might help make this photo more interesting. I personally don't really like how the car is cut off... and the shadow that's falling across the lower half of the photo is also bothering me. But it certainly is a very interesting subject!
For those who asked about the car, it is one of the Cadillac's located at Cadillac Ranch in Amarillo, TX. //www.roadsideamerica.com/attract/TXAMAcadillac.html
Seems a little light on the challenge aspect, but a very nice shot. The little boy seems a bit overly shadowed. Nice title. Extra viewing has lowered my overall impression. 8 Swash