Looking for feedback on repeated quality rejections

I'm relatively new to Adobe Stock and have submitted several photographs, but most have been rejected for quality issues.

I'm using an iPhone 13 Pro, and the photographs look sharp to me, even when enlarged. The images are full resolution (3024 × 4032 pixels), and I've been uploading JPEG files.

Some of my photographs taken with the same iPhone have been accepted, so I'm having difficulty understanding what makes the difference.

I've attached one of my rejected photographs as an example. I'd really appreciate some specific feedback on what technical issues might be causing these rejections and what I could improve for future submissions.

Thank you for your help!