I assume it was rejected for quality reasons, which you should indicate when you upload here for feedback. There are several notable issues: 1) underexposed shadows on the left; 2) perhaps over saturated; 3) artifacts in the sky; 4) a sensor spot / dust spot in the sky; 5) White Balance seems a bit too blue.
Definately the artifacts in the sky and the two sensor spots. Also the movement in the people in the front.
You should submit your photos as jpeg as large as possible.
The sensor spots in the sky can be corrected. If you have a raw file, you could probably also correct the overprocessing and the "flat" look. But even with a perfect image, you would need to submit model releases for some of the persons in the image. So no, it is not worth to rework this.