Not a judge but my .02
If you had different sized pieces of chicken place the smallest in the front then the medium sized ones then the largest in the back. Angle them a touch so that one sort of hides the size of the next. It would also look more uniform. They sunk in to the parsley and it would be nicer to see them not so hidden. that said, i would have loved to grab one and bite into it. looks good.
Those meatballs reminded me of a box of golfballs. (a box that wasn't square, sorry) I would have spaced them so that you had a symetrical appearance.
Not having built a box before, is it that hard to get the meat to sit on top of the bed of parsley? it seems to me that meat sitting on top would look like a trophy on top of a platform rather than something hiding in the grass.
if i could take a BBQ class from someone good for $100 I'd be all over it. Where I am, there is nothing. I think the closest competition I have found was either in PA about 3-4 hours east, or in Cincinatti which is 5-6 hours south. At that point I may as well drive to Chicago if they have something.