Preview or not it doesn’t look good.
I appreciate it’s frustrating to be rejected and it’s completely your choice to push on with this file. It’s only my opinion but I still think you are a log way off the necessary quality.
It’s not only the pixelated -
- there are issues with basic design fundamentals like typography, spacing, margins etc.
- there is nothing unique about the design (look at others already for sale and the variations, little details, individuality etc.)
- the execution and attention to detail of premium files just is not there.