Before I start, I just want to say that I'm not trying to nit-pic, or in any way be rough on you. I'm just telling you what I see. What I do is I look at each picture for no more than 5 seconds just like if I were sitting at the table. That is how I get the scores. The comments are after I've had some time to figure out what I liked (and didn't like) about each box and this can take some time...
OK, that being said, here it goes the scoring:
Chicken - 7
Ribs - 7
Pork - 6
Brisket - 7
Now the comments:
General: I would really try to make the parsley as even as I could around the boxes. Now before anyone starts ripping me a new one, I know that this is a meat contest. What I am trying to get across is that you want to distract from the meat as little as possible. By making the garnish look like it's almost painted on, it becomes a background for the meat so that the meat is what is looked at and not the parsley going all over the place.
Chicken: Nice color, I would try to find 6 that are about the same size (the one on the top center is much larger than the one on the bottom left). I would also trim off the "toes" at the bottom of the top center, bottom center, and bottom right, it looks like they are going in different directions. To me, the Top Left is the best looking trim and and size wise.
Ribs: Great color! In general, I would try to fit more ribs in the box, it looks a little 'skimpy'. I think I would put in at least 1 more rib on each level. I would also turn the ribs around. It looks like you have the pull back (bone) facing down rather than up. This gives the ribs a more uneven look to them. If you are trying to hide the bones, you need to put some parsley in front of them.
Pork: While the color looks good, (and this may be the pron) it looks like there is a layer of fat on a couple of the chunks in the front (esp. upper left and lower right) that is just turning me off. This is the one box that the parsley really bothers me. It's just way to thin and because of that it looks like the meat was 'tossed' into the box. I would also try to line up the sliced meat a little better; you did good on the right side but the left side needs some help. As for the the 'chunks', I would make them a little smaller and add more of them, there is to much green between them for my likeing...
Brisket: Again, your color is great! I would have made the burnt ends smaller and added more than six of them to the box. The slices need to be lined up better and I again would put more than seven of them in the box; you'll be amazed once you tighten up the slices how much you can get in there. The glaze looks kinda greasy but that may just have been the lighting.
Over all, for your first try you did great! Good luck!