ライティングに気を付けたが技術的な理由で拒絶

I agree with @Ricky336 and @Jill_C that the background is overexposed (you see it in the histogram and the red areas in your picture).

But in addition, the picture is out of focus. And the subject is not correctly exposed and is missing contrast. Backlit photography is not that easy to handle correctly, if you are a beginner, you should start with simpler backgrounds and concentrate on your subject.

Also, as a beginner, you should submit one or two pictures and wait for the return. It doesn't make sense to work hard to title and keyword your submissions, just to get them refused.

As your pictures are out of focus, I see little hope to correct.

If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html