¿Alguien puede decir por qué esta foto no fue aceptada?

[Jhigcas]

Hola: 

Estoy empezando en esto, y me han rechazado esta foto. ¿Podríais decirme por qué y algún consejo para mejorar? 

Gracias.

[daniellei4510]

Grain and loss of detail. Was this taken with an actual camera or a cell phone?

[Jhigcas]

It was taken with a Nikon D7100, bur with a big cut of the original frame. 

[daniellei4510]

That explains it then. And as @Nancy OShea mentioned, the crop should have been even tighter, but then you'd really have issues. Unless you can find an incredibly good upscaler, which I don't think exists as this time, I don't think there's much to be done to improve the equality of the image.

[Nancy OShea]

In addition to what @daniellei4510 mentioned, I think the composition could have been framed better.  There's too much pond and not enough subject.

For comparison, below is an example of Stock inventory that was accepted. 

https://stock.adobe.com/search?k=bullfrog

Adobe Stock customers expect the highest visual and technical quality for use in commercial projects.  Read these links for more tips.

• 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-illustr...
• https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html

[Jill_C]

There are some bright white areas that appears to be blown out. A longer lens would have been needed so that you didn't have to crop significantly. Also a lower ISO, as the noise is still evident.