Rejected my work "Postcard Vertical. Top View. Mock-Up v1"

Hi!
Rejected my work.
I want to know your comments.
Thanks!

https://drive.google.com/file/d/1rIiB4ZEdCXcLCO65gIr0-tOspFpf4xZg/view?usp=sharing

hi I think that u should ask @DesignSomething he is the most likely to give u a clue for such a type of item

The Mock-up is too simple. Add more isolated elements (like 3D basic shapes) that helps customers to create unique scenes.

Many thanks!
Totally agree with you