Rejected by "Similar content in our collection". But using image search in Adobe, nothing similar

B&W photos are not what Stock customers want.  Sorry.  Customers want full color images that are suitable for commercial use.  Posters, product packaging, TV ads, marketing, merchandise, etc.

If you're new to Adobe Stock, read your Contributor User Guide for more tips about what's expected.

• https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
• https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
• https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/photography-illustrations.ug.html
• https://helpx.adobe.com/stock/contributor/help/how-to-submit-distinct-content.html
• Model/Property Releases:
  https://helpx.adobe.com/stock/contributor/help/model-release.html
  https://helpx.adobe.com/stock/contributor/help/property-release.html
  
  

Hope that helps.

pic852.jpg is quite over-saturated and also not sharply focused.

@RALPH_L, post about the monochrome images is correct, but it was probably a bot that (not "they") that decided your assets were similar to others in the database: See the last couple of line from this Adobe announcement:

• 1. We have expanded our moderation policies & platform: We are investing in both people and technology to scale moderation for the massive increase in weekly submissions. First, we have tripled the size of our moderation team. Second, we have introduced new technology to help evaluate new submissions and audit the existing collection against our new policies. This expanded auditing has resulted in the reclassification and removal of over 100K assets.

The moderator selected the wrong rejection reason. Your photos should have been rejected for "quality". Monochrome is not allowed. The photos are too dark.