I feel like your hard work is paying off, and I've seen a noticeable improvement in your work since I've been here.
Here is my honest opinion- I don't think that your character design style is mainstream enough to hit the sweet spot for the judges in terms of their sensibilities. It doesn't fall into the current children's market style range, and it serves more of a niche audience that likes twisted humor in an edgy cartoon style. That is not supposed to be discouraging, niche markets are not a bad thing and can be an advantage in many cases. My hunch is that it's just a mismatch of personal tastes. I feel like I've seen a couple of the judges comment on the way you stylize certain things in some of your previous illustration threads.
I think if you had kept the cannibalism concept as is- but made the characters very mainstream cutesy and perhaps made the lighting more cheery, it might have been a stronger contender in the judge's eyes. This is just speculation on my part however- I can't speak for the judges.
That being said, I hope you don't stop contributing pieces to the contests! I look forward to seeing your take on the prompts each week. You definitely have a unique voice in your artwork.
I hope this wasn't a harsh critique. It wasn't meant to be.