:O didn't even realize the cows! wow! This picture reminds me of when I went to Mexico. We fit 17 people in a small van. If you think about it, 17 people seems like a lot but honestly we could have fit so many more because only 2 of us were sitting on other's laps. I do have to say that we were INSIDE a van, so your picture is MUCH more dangerous. That thing could easily tip over.
Have you tried cropping this at all? I would try cropping the rear view mirror out and also the bottom part where it seems there is some clothes in the windshield. I think it would be more dramatic if you did so. If you don't have a photo program, you can upload it to picnik.com and crop there free.

I left the windscreen etc in to show why the quality isn't the best, Photographing from the back seat of a moving car is difficult.

the overall quality of the photo really would look better if you trim it.

I think this photo is brilliant. The fact that you were in the right place at the right time to catch these people riding down the road with 3 or 4 cows in the back of a Jeep is a photographic blessing. And the fact that you shot it from the back seat of a moving vehicle adds to the "OMG" factor of the shot. It also says something about the incredible manufacturing of the vehicle carrying all of that weight. I Like It......

even i have traveled like that last man hanging on the vehicle lol