Watercolor pack - HARD REJECT


I’m a newbie here and slightly surprised, because my first pack was rejected with the reason that my submission was not the quality they require. Actually I really would like to know what they mean under minimum technical quality. They wrote to familiarize with the products which are already uploaded, and I did so, and found that there are a few of the similar quality as mine. Let me know if I’m wrong, or please give me feedback so I can improve.
If you have experiences, please help me. Thank you in advance.


Is anybody here? Please, I would like to know what I did wrong, that they hard rejected my product.
If anybody can help, please write me.