OK, here goes, just remember you asked for this:
Chicken: It looks blotchy, uneven application of sauce or something, doesn't have a uniform appearance, except for size; they all appear to be about the same size. Garnish kind of plain, some parsley would have spruced that up a bit. It just doesn't jump out at you with any type of WOW, that looks great. (7or Eight)
Ribs: the box looks too crowded, you could have eliminated either the top or the bottom piece and it would have looked less cluttered. Better job on the garnish on this box, looks better than the chicken. I think the color looks fine, hard to see the meat, but it looks like some sauce smudging on the two side pieces on the meat. But overall, I'd give it an (Eight), it looks appealing to me.
Pork: Much better garnish job! That piece right in the center of the box, caught my eye right away. The bark pieces look good, the meat looks a little mushy, like you just grabbed a "clump" of it and put it in the box. (Seven)
Brisket: Well the meat looks dry, no uniformity is size of slice, looks like it was thrown together. Look at your pork box garnish and look at your brisket, you'd never guess it came from the same team. (Six)
That all being said, I'd eat the chicken, ribs and pork, the brisket I'd eat, just doesn't look as appetizing. Good backyard stuff, but comp quality lacking.
IMHO and you asked. Tell us what your actual scores were later on.