Pointing your camera lens directly at the sun can be problematic, particularly if you don't take precautions to protect your sensitive camera sensor from damaging rays of direct sunlight.
This landscape photographer discusses some of the pitfalls & his techniques for overcoming them.
You will need to give us the rejection reason. We do not see inside of your account.
@daniellei4510 is right, the picture is tiny. But out of experience, if the refusal reason is "quality issues": check for chromatic aberation, focus and white balance, maybe also contrast.
ABAMBO | Hard- and Software Engineer | Photographer