Rejected photos

This is your competition in Stock inventory.

https://stock.adobe.com/search?k=hypodermic+needle

1) Your syringe is not realistically accurate. The dimensions are all wrong. I assume this was generated by AI?  Don't trust AI to give you accurate results. Always compare with the real thing.

2) Place your subject on a transparent background and submit 1 version as PNG with transparency. 

No other variations required. Customers will color images to their own specifications after purchase.

If you haven't already, get familiar with your Stock Contributor User Guide. It contains much valuable information. 

• 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
• https://helpx.adobe.com/stock/contributor/help/vector-requirements.html
• https://helpx.adobe.com/stock/contributor/help/generative-ai-content.html
  
  

Hope that helps.

There's a rule a moderator might have taken too literally the rule that changing colors on the same image is not allowed. Perhaps here, even though it's a single image, the moderator considered that cause for rejection. I'd try submitting just one. As you've done here, the buyer can change the colors to whatever they want.