Rejected due to technical issue?

It's a great picture, I guess. But there are some faults. First, it's overexposed, you could bring down the exposure, and it would be a lot better. The histogram shows a preponderance of the whites. I suppose you can correct that easily.

The biggest fault is the missing sharpness of the eye of the insect. That should be sharp.

Then there is a certain noise level, and it's not the flower structure. I have also the impression that you applied a huge amount of sharpening. Some structures really look over sharpened. That would also explain the white halo around the insect's antennas.

And then I have this area

which is disturbing me.

As I said: It's a great picture, and I would have been happy to get such a beauty, but it maybe not good enough for the stringent eyes of the moderator.

I would correct the exposure, check if one or the other points of critique could be corrected, and then I would resubmit. There is a good chance that it may pass.

Nice! I think it is a depth of field issue and there is a white halo around the outter feeler.

I really like this one.  The technical issues are less apparent, but I think this comes down to how the photo will be used and fitting the needs of that particular use. 

I suspect many popular Adobe Stock assets are used in composite work, and this photo had enough out of focus areas that I think getting a selection would be challenging and it would look out of place with some in focus and some out of focus areas.  

There is some visible noise and it's a bit overexposed, but I believe those would be fixable if not for the depth of field issues.

I hope you also have a pleasant day 🙂