How do you get edited pictures on amazon?

I am trying to list a product, but it always ends up suppressed. The product is a customizable lettering. Obviously, pictures of the product don’t do it justice and any picture that looks realistic looks photoshopped and just typed on.

When I upload a real life picture, the suppressed listing then becomes active, but the image looks like garbage. When I use digitally altered pictures, like my competitors are, it gets suppressed. What’s the way to uploaded digital text as the main image?