Photo 1: Out of focus. What is the subject and what is the comercial value?
Photo 2: Artifacts. Not focused. Underexposed shadows. Poorly cropped.
Photo 3: Not focused. Artifacts. Poorly cropped.
Photo 4, 5, 6: Not focused. Artifacts.
Photo 7: Not focused. Artifacts. What is the subject and what is the comercial value?
You have a focus issue and JPEG compression issues through all of the photos.
Honestly, the focus is so poor in all of these that I think you should have your cameras/lenses evaluated and calibrated.
Are these the original photos you submitted? They all look very small previews to me. If you can submit one or two of the actual files you submitted which were rejected, it would be easier to give you a more thorough evaluation.