Brisket: Try to get a little thinner on the cuts....even out the pieces in the box...i.e. show the same amount of brisket slices.....
Chicken: may be camera, looks real dark and scorched....try to get pieces that are the same size in the box together....
ribs: work on removing brush strokes in the sauce....usually if you use a glove you can smooth them out...also, not too sure of people have had much luck with separated presentation....put some extra in there, make the box look full.....
Pork: looks nice....good chunks, and bark....looks nice and moist.....maybe straighten up your money muscle in the back......
It takes numerous tries at different presentation options.....when practicing I will usually take a picture, then close the box, work on another presentation and then open up a previous box again.....trying to think to myself, what can make this "pop"....or stand out a little more......the good thing about the pictures is that is shows things like the brush strokes in sauces, color, etc......overall, you are on track....just work on uniformity a little, and you will increase your scores....