quality questions

Check your histogram.

There are no whites and you have strange peaks. I never saw such peaks in a natural picture.

I also think that you have taken out most of the saturation.

I think, it's sharp, so with the correct adjustment, it could pass.

Hello,

Read these links!

User guide:
https://helpx.adobe.com/stock/contributor/user-guide.html
Exposure:
https://www.adobe.com/creativecloud/photography/discover/exposure-in-photography.html
Composition:
https://www.adobe.com/creativecloud/photography/discover/photo-composition.html

Quality:
https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html

It's underexposed. Did you convert the background to black & white? Such conversions are not accepted by Adobe.