Question about image quality rejection

Hi everyone!

Recently, several of my photos from a series were rejected due to quality issues, although other images from the same series had previously been accepted.

The shooting conditions and editing style were the same. What could be the reason for this? Has anyone experienced a similar situation? Could it be related to stricter moderation or specific technical requirements?

I'll attach two photos for comparison: the first one was accepted, while the second one was rejected.

I'd appreciate any advice or insights. Thank you!