Chip, your piece is great! I love the macabre take on the three little pigs concept, and the cackling wolf/teacher. You do a great job with storytelling and the contrast and lighting makes the focal point stand out. I'm not sure exactly what their criteria are for the contests, but please don't be disheartened. I look at this piece and can't wait until I have gained the skill to create something like this!
Great job on the steam clouds coming from the hot pork products, but I'd love to see how she got them so fresh and steamy-good. It could be funny if she has a mini electric griddle and is cooking them right there or something, making the smell of grilling pig permeate the cafeteria. You could even have some of the background pigs be looking over in horror (but of course, this is your piece and it's great as it is too!).
You could also possibly play with the wolf teacher - I love the laughing, amused versio, but you could also explore a more menacing wolf, getting ideas about the pigs from seeing and smelling that tasty bacon.
Anyway, this piece is fantastic, and I can't wait to see more of your work! Don't give up, and you will be recognized for your work because you've put your time and effort into making it great.