Naah, it's not nonsensical. Possibly long, but I don't care about that. I'm only replying late because I got distracted.
Personally, I'd say that the one you say is the best is very...everywhere, what with the spirals being a little too articulated and repeated. Lowering the contrast could possibly help, and then maybe doing something about the center.
While I can understand "jagged" and "sloppy" I don't think they are "pixelated". Now I know they look pixelated in the thumbnails, but I wouldn't call the picture itself pixelated. (Example. Compare to the thumbnail) Now, if you weren't looking at the thumbnails that statement just got awkward for me. But whatevs. Actually do you know how to fix thumbnails to not shrink the pictures billineary?
Thanks for the critique and information! I already suspected that there was a lot of quality control for what would get accepted, but it helps anyway to know where you have your standard.
...
I'm sorry if I don't make sense, it's late and I need to go to bed.
I was going to write something longer before I realized how late it was, so I'll just going to sum it up:
No hard feelings
Of course I won't give up
Something about what I consider my best work, but I think I'm too tired to put it in a way that wouldn't make me come across as too self-centered.
Something about how good the reply made me feel
Cuddles and hugs
And high fives
*Collapse on bed

None offense taken. "Amateurish" is almost a compliment for me. Because that's kind of what I am.
Thanks for the reply! I'm sorry if mine is a little late, but...distractions happened. Also my browser decided to redirect me to another random site while I was typing this and everything disappeared. Deviantart needs a reply-draft system.

I have already taken upon me to make one wallpaper for every single greek letter there is, so sadly that won't stop in a while. Although I'm more than two thirds completed.
But it raises a question. Do you think I should upload the wallpaper backgrounds which effectively could stand on their own legs to deviantart?

I probably won't upload the 6 o'clock wallpaper separately since it's already part of two packs (the Seasons, and the subpack Summer/ιota, which was separately uploaded before Seasons) and it would feel kinda like spamming my watchers with basically the same content if I'd do it again.

Of course I will take the criticism to heart. And then I will let it grow and improve me. I'm not giving up on wallpapers because someone told me how I can do them better, that's silly.
Also, while we are on criticism, can I ask you to look at a specific piece? Specifically, this one, which is what I personally consider my magnum opus in momento.
Sorry for the short in retrospect it's rather long actually and probably confusing reply, it's [many] hours since I should have gone to sleep.
Cuddles and hugs