Barrels of Fun

I need some suggestions here. At the state fairgounds elementary school children have been painting trash barrels for the upcoming state fair. I've come here a few times to try and shoot these barrels (there are about 100 or so lined up) with little success. This is just one sample of a shot I took that seems lacking. Am I wasting my time here, or do you have any suggestions if I go back and reshoot. Thanks for your input.