It’s all about marketing. Taking good pictures, making a replica, or making a well-known fictional aircraft can get you a lot of upvotes. But how would I know, I do none of the three.

Logic

they're quite good
you just gotta take better pictures

The photos of the build should take up most of the screen.
A good description is always a good thing to do. Even a brief 2-3 sentences is always better than seeing the words “No description.”

Here's the solution

If they are so amazing, they will get upvotes.
Lack up upvotes is due to failure in one of these categories:
Screenshots
Name
Description
Spotlights (can be helped by communicating with higher level users)
The build actually sucking

git gud lol also read @FishMiner , comment

Your thumbnails are zoomed out and in orthographic mode.
Taking pictures directly from the front is not good.
And turning the turrets of your tanks in the designer is annoying.
A detailed description would help too.

From the look of it, you are making amazing posts, but forgetting to upload with a flashy screenshot.

I dunno