Quality control issue with some of my photos

Keeping in mind that Stock is a marketplace for commercial-quality images, this is what you’re competing with in Stock.

https://stock.adobe.com/search?k=drone  8.1 million results

Read through your Contributor User Guide for more tips.  

1. https://helpx.adobe.com/stock/contributor/submit-your-content/submit-photos/technical-legal-requirements-photo-submission.html
2. https://helpx.adobe.com/stock/contributor/submit-your-content/submit-photos/photo-editing-best-practices.html
3. https://helpx.adobe.com/stock/contributor/content-moderation/quality-technical-standards-reasons-content-refusal.html

Hope that helps.

The top 2 are blurry and underexposed, and the subject is too small in the frame.

creo que el problema que tienen estas imágenes es ruido en las zonas donde limita la luz con las sombras, y problemas de composición, la idea esta buena, pero para trabajar con siluetas hay que tener mas cuidado por que no hay detalles. por eso es que la composición si el contraste debe de ser limpio e impecable   

Regarding the quality issue, it is because the subject appears completely black due to the backlight.
If the footage had been bright and clear, it might have been rejected due to IP issues if it was a commercially produced drone.

I don't think it would help. There is no detail in the picture at all. I understand you want to keep it in the shadows, but it's the detail that sells the picture. 

The point was to make the pilot non-recognizable so I could work with the general term of an “FPV drone pilot”, not Jan the FPV drone pilot. I don’t really get why that should be a problem… For the first two pictures, do you think it would help to crop in? Thank you very much for your response!

The subject is too small in the top two and I don’t think the silhouette works here. You’d also need a model release, since if you open up the shadow the subject becomes recognizable.