It is a crap shoot... A couple of things that have been mentioned already...
1. Never enter a "mixed" or "multi" media show. Only enter photography shows so your work can be judged apples to apples.
2. If possible, know as much about the jurors as possible beforehand. Then submit entries based on that knowledge. For example... a long time ago there was a contest with Photo Review. George Tice was the juror. I entered several BW pieces from Mr. Tice's stomping grounds... Paterson, NJ. Took 2nd place and $200.
As said, take the high road, make more great images, and don't let it eat at you. Good luck!