Well, in getting rather used to Adobe's colour preference, I would say the problem here is white balance. It is a bit yellow, has a yellow cast. Perhaps this was intentional, but probably for Adobe's criteria, it is rather on the yellow side - it's too warm. I would suggest correcting this.
This splurge is from Adobe:
If we determine your file to have technical issues other than focus, exposure, or artifacts, which we call out specifically or if the file is determined to not meet our overall quality standards the "Image Quality" rejection reason is selected by moderation.
White balance: The white balance may be too warm or too cool.
Note:
When you shoot in raw formats, you have great flexibility to adjust the white balance in your post-processing workflows.
Contrast: There may be too much or not enough contrast.
Saturation: Oversaturation may give your file an unnatural look, but under-saturated or spot color can also result in technical decline.
Note:
You may want to try the Vibrance slider instead of Saturation in Lightroom.
Selections: Editing must be done inconspicuously. Selecting objects out of their backgrounds (or masking) to composite into new images requires time, patience, and care. Do not submit images that have been poorly selected or look like they are not a natural part of the scene.
Chromatic aberration: Refers to color fringing around objects in the image.
General composition: Is your horizon straight? Have you cropped the image too much? Consider leaving a designer room to add their own text or objects.
https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html