One set of uploads completely accepted while other set of uploads completely rejected.

Hello,

First image of bird - dsc0003- 

The histogram shows underexposure.

Underexposed, a bit too yellow and chromatic aberration - green edge around the bird.

You have to increase the shadows, increase the exposure and decrease the highlights to maintain the detail in the feathers:

e.g

Learn about the histogram among other things:

This shows how your pixels are displayed from dark to light.
https://www.adobe.com/creativecloud/photography/discover/how-to-read-a-histogram.html

Hi @aleksandarfoto,

You needed to increase the exposure of the first file.

The composition of the second file is not good. You should include more of the chick and place him in focus. There is also color fringing on that photos. You'll find it at the top of the chick.

The third file composition is not good. You have too much negative space and just a tiny bit of the chick's head. The image seem slightly dull posibly due to either lighting, highlights, exposure or blacks adjustments needed.

The fourth image has purple color fringing.

The fifth photo has color fringing also. 

Zoom in on the rest of your images at between 100 and 200% to check for color fringing, white balance and exposure issues.

Best wishes

Jacquelin

Why is it that one time i upload all photos got accepted, and another time all got rejected, while the same photos on other stock sites were all accepted.

By @aleksandarfoto

It was never an argument by saying that the assets got accepted somewhere else. Moderation is done by humans, so different moderators or even the same moderator at a different time in the workday may take a different decision. 

But mostly, fir pictures presented here in this forum, they have been rejected for reason. Rare are the situations where we can't explain one or the other, mostly multiple, errors with the asset.

People only complain, when they got refusals, never erroneous acceptances.

I did a quick check on all 10 assets uploaded here, I would have rejected all of them for bad composition. Most of your assets are obviously ill cropped, I suggest you read about composition. Contrary to comon believe, composition is not an oppinion matter, but there are well established rules that even the old masters in painting followed. https://en.wikipedia.org/wiki/Composition_(visual_arts)

https://en.wikipedia.org/wiki/Golden_triangle_(composition)

Some of your assets have multiple issues, however. 

Different reviewers make different judgments.  Work is rarely examined by the same reviewer each time.

Technical Quality = ALL aspects that contribute to a photograph's visual clarity and accuracy. Composition, focus, exposure, lighting, color balance, contrast, and the absence of technical flaws like noise or artifacts.

Read the Contributor User Guide 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

None of these should be accepted because of bad cropping and bad composition. And one seems to be shot through a window.

Well I can't tell from how the images are laid out which ones were accepted and which were not, but in this example, the problem is poor cropping.

DSC_0022.jpg - that ugly fencing sort of ruins the composition; have you tried removing it?

DSC_0015.jpg - nothing in sharp focus and not well composed (should be cropped)

DSC_0020.jpg - DOF is too shallow, affecting the focus

DSC_0024.jpg - not well composed, and the fence ruins it

Most zoos do not allow commercial use of images taken onsite. So, if you really want to submit such images to Adobe Stock, perhaps in violation of the zoo's regulations, you must make sure they do not look like they were taken in a zoo. Thus, no fences.