How can I understand the errors in a rejected project

Hello everyone, in the last few days I have tried to publish two of my works, just finished. Unfortunately, I had a hard reject on both.
I wondered if there was any way to understand what were the mistakes I made, where I can improve and how to direct myself in the publication of new projects.
I put the two previews of the projects at your disposal. I very much hope for your response and some suggestions for improvement.
Thank you all for the possible comparison.

Have a nice working day :slight_smile:

Here the link to watch the two videos: