First let me say that these boxes are really impressive for a first time. Clearly you know what you are doing. Having said that, here are my thoughts.
Chicken:
Bold move going with breasts, but from the scores it is clear you pulled it off. Great work. I really like the angled display and I think that the color is good considering there is no skin. I am a bit concerned about the crusty end pit on the top breast. If a judge had picked that piece, it might have been pretty dry. Consider leaving the end bit off of each piece. Remember, if it is in the box, a judge might pick that piece to try. Also, it seems a bit cramped, so leaving off that piece might allow it to fit better(The bottom breast is touching the box which has left some smudges). Lastly, your sauce is a bit gloppy in a couple of spots.
I would say 8 in appearance
Ribs:
I dont think that the angled display works very well here. I would consider rotating the ribs 45 degrees so they are in line with the box. I agree with others who have said that they are a bit too dark as well.
Depending on how it looked with the other ribs in it, I would say 7 in appearance
Pork:
the pork itself looks pretty good, but the layout needs work. The pulled looks like it was just sort of thrown in. I think there should be a more defined space between it and the box. Also, I am not sold on the chunked being wadded up in one corner of the box. That could work if you had a third element to put next to the chunked...sliced for example, and then the pulled is below it along the entire box, but as it is it sort of looks accidental.
I would say 6(maybe 7) in appearance.
Brisket:
I think it looks pretty good, but there is one big thing, and a couple of nitpicky things I noticed. The biggest thing is that the slices are too far back in the box. If you were to move them closer to the front, you would have more room to make your ends neat and tidy. The nitpicky things include flecks of something on the slices, streaking in the meat, and the ends look a bit dry.
I would give an 8 in appearance.
These are just my opinions, so take them with a grain of salt. BTW, with chicken scores like that, did you get a walk?