Picture rejected because of quality issues

A big flaw with AI-generated images is that shirts and jackets are always full of weird folds and wrinkles and the fit isn't right.

The pillars should be the same in size and shape - at least the outermost ones. His forehead is jagged.

Having a second look at the image, it seems to me that the splashes are OK, as the construction looks like a gate. there is a world before and a world behind.

But I have found a different problem: 

The hais to the left is aligned, but part of the beard looks detached. 

I have to say that the "soft" look did not disturb me.

@Patrick33865737usku  Your image was not rejected due to the details being wrongly "drawn" or the fact that there are no waves under the water.

The "theme" of your image is obvious so if someone expect "realism" in a cartoon setting. Well, we would never see a talking spunge or a squirel in a space suit, under water. Would we? 😉

Most likely the reason is the overall "softness". Don't know what upscaler you are using, but some of them has the tendency to blur the lines. That might trigger the reviewer.

This is obviously a Generative AI image.  

AI can't replace real artists.  It makes too many mistakes.  And it's too stupid to know what mistakes it makes to correct them.  That's the contributor's job.

Closely examine every quadrant of every image at 100-300% magnification and correct all defects if you can.  If not, discard the image and start over or cut it up for use select parts in other projects.

From where I sit as a Stock customer, I'm fatigued by so-called AI artwork.  It looks fake.  There's too much of it and while some of it is truly excellent, the majority is nothing I would ever purchase for use in a commercial project.  I think it's harder to do than most people realize and an even tougher sale.  That's just my 2 cents, BTW.  Others here may disagree.

Good luck.

Just a quick look reveals that the beam atop the columns has poorly drawn details. The columns are also inconsistent in the design details. Though there is no expectation that such an illustration be "photo-realistic", there is an expectation that the drawing details are consistent and properly drawn, such as no incomplete lines or lines out of place.

A nice picture, but obviously, there are no waves under water:

You have drawing errors:

Any of these could have triggered the quality issues.