Scoring from pictures is not always fair, more time can be spent studying the box, and color and brightness is different than in person, but here are my thoughts.
Chicken: I like the color, and the diagonal placement is interesting to me. The sauce does look a little uneven, but it doesn't look like it is completely saturated with sauce (oversauced). Based on pic I score 8.
Ribs: The brush marks are distracting, but again the sauce isn't too thick. A little shine would make them pop a little more. It looks like the bones are very short, that they are cut almost as wide as long, just looks a little off. The upper right rib almost looks like the right side was torn off the rack, not cut. Looks ragged. Score 7.
Pork: Looks pretty good, nice amount in box. The slices look like they were not all oriented the same way, (cut end on some to front, some toward back). And that upper right slice does look like large fat along the edge, it may not do much to the appearance score, but if a judge doesnt like fat it will kill your taste and tenderness score. Score 8.
Brisket: Slices look very dry. They also look like the top edge had some knife cuts in it before cooking, very rough looking. It also looks like you turned some of the slices around (slice 3,4,5 look like they alternate direction). I think placing the slices exactly as they are cut off the flat gives more symmetry, and thus better appearance. Burnt ends look just ok, they don't wow me. I don't score down for the tiny pieces of bark that are on the face of the slices (left corner of first slice, 1 inch from right on 4th slice) but you will have some judges that do, so clean that up a bit. I can't decide on this score, from picture 6 or 7, at table could be 7 or 8.
I never even look at the garnish at the table but if you had the parsley tighter the meat would stand out more.
What were your scores at the contest if you don't mind sharing?