Rejected due to technical issues. How can I get approved?

Nice creative work. I love it, but I think that it won't pass as this, as for the moderators, it needs to be perfect. When I'm doing such creative work, I do it for a purpose. And it needs to be good enough for that purpose. But as stock is for any purpose, you have to invest a lot of time and energy to get it perfect.

I looked into your middle image, the one with the power lines.

The neon is not good anti-aliased, so it blends very hard into the background, especially around the antlers. The look is more like a paper cut-out and not a natural blend.

In addition, you have kind of a “halo” around the deer:

And I saw some “pixel errors”:

Besides, the energy theft from the power lines doesn't look convincing. At first, I thought it was a bad cut out.

@Nikolai-choi very creative work.  The one issue I see in all three images is in the sky - you've got posterisation (banding) of the sky.  The backgrounds have some vignetting that should be removed to even out the exposure.  The white balance is very blue, but in this instance, it probably isn't an issue and seems to suit the photo.

Take a look at your photo at 100% magnification after you make your adjustments before you resubmit.

Good luck.  Let us know if they get accepted next time around.