Receipt

Please find here information on royalties paid by Adobe:

Royalty details for contributors to Adobe Stock

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

You don't get to set the prices.  It's irrelevant what people pay per image.  Your royalty is based on total sales.

Prices paid for individual images vary widely based on:

• Which Stock plans the customers have purchased (10, 25, 40 or 750 assets/month). 
• If the assets are from basic or premium collection. 
• Which licenses they choose  -- Standard, Enhanced or Extended.

Stock Plan Pricing

https://stock.adobe.com/plans

Stock Licenses

https://stock.adobe.com/license-terms