If an artist submits their work to juried exhibitions, they should plan on having their work rejected a fairly high percentage of the time. And if they make a serious emotional investment into the work, they should also plan to feel the sting of rejection fairly acutely. No one, even well established artists, has their work selected for every show they enter. There are just too many subjective variables at play to expect every juror to single out your work for inclusion. Besides the fact that your work may not be stylistically appropriate for a particular exhibition, jurors inevitably come to the judging table with a truckload of biases. Sometimes those personal preferences work in an artist’s favor, other times they don't. If your work is rejected, the important thing is to shake it off, learn what you can from the experience, and keep plugging away at it.