First of all, this is just my personal taste, of course, but I think the photo is really ugly. It also looks like it was generated by AI, and you can’t tell at all that it’s a tank. Most of all: When I open the project, I see that you’ve taken such beautiful photos!
That’s the right way: The perspective is great, the lighting is great. You can tell what it is: a tank.
Now take another photo like that, but maybe in a more interesting setting. Check out how the top downloads are doing it.
Keep in mind: Users decide within fractions of a second whether they want to print something: Many avoid AI (even if it just looks like it) like the plague. You want to appeal to hobbyists who want to build their own tank: They want to see real photos. You’ve got a really great project here, but you’re ruining it with the cover.
Those kinds of over-the-top covers might work for dragons and decorative stuff, but those are different customers: You want model builders, fans of tanks, etc. Also: Your model is really solid - really good - but with a cover that’s so over the top, you’re setting expectations so high that they can only end up being a letdown.
However, as I said, that’s just my opinion - it might not be right. I just think an honest cover has more staying power in the long run than these over-the-top ones.
Check out the covers of the top downloads in the contest - they’re all down-to-earth. Anything that even remotely resembles AI sinks like a stone in water. It’s also worth noting that most people probably want tanks modeled take a realistic approach.
To be fair, though, you have to admit to yourself that: The competition is extremely tough. It’s hard to keep up. You’re just a few months short of the experience necessary to compete in this shark tank – a situation you created for yourself. Calmer waters might be a better option. Competitions are really more for pros, where the presentation accounts for nearly 50% of the success.