QUALITY ISSUES

It's clearly visible that at least two photos not sharp, the forest is blurred, the scopion tail and background around are not sharp

Can anyone explain if Adobe's policy on image verification has changed? The quality of my photos used to be many times worse and primitive, and they were accepted. 

By @Olga32246262ylnl

Hello,

It may have changed - it is tighter and more stringent - probably! There are many, many more people submitting images. The market is absolutely inundated with images. There absolutely needs to be tighter quality controls, therefore the quality of these images is not as good as you may think. Often, one is blind to one's own mistakes. Looking at these photos without any background knowledge, there are a number of quality issues, The scorpions could be sharper; I suspect the shutter speed was too slow - there are signs of bad motion blur.

For instance:

Landscape image - too underexposed, noise and colour balance to some degree.

Sorry, the quality isn't that good actually!

The first image has blown highlights, noise and a too-shallow DOF

The second image is quite blurry 

The third image is underexposed and extremely noisy.

Your first:

Colour noise, blown out details on the lighter elements, small DOF.

Your second:

A weird falloff in quality at places, like a failed image optimization.

Your third: noise, missing blacks, missing whites.

If the quality of your prior photos was worse than these, and they got accepted, you were lucky. I got refusals for pictures of similar quality to yours here, 5 years ago.