Pictures rejected due to Techincal issues

Hello,

You have problem with exposure, they are a little underexposed.  Look at your histogram. There are also problems with focus, they are not sharp, but this is due more to depth of field - it is very shallow. You don't have any point of focus - meaning where/what can the eye focus on?  Eg, The bee isn't sharp:

The composition is not that good. I also think there is a problem with the white balance.

This is from Adobe's help files:

https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html