Why are my designs rejected?

Hello, I recently uploaded high quality designs. But I’m getting automated emails that it doesn’t meet quality standards. I think there is no quality standard. I see sloppy designs newly uploaded to the market. Please take a good look at the designs. It is presented in a modern and international style. It should not be so easily rejected.

Waiting for your comments. Please.

Lack of color perhaps. Yes, like a variation, no like an item.