Isometric assets - Hard Rejected

I have uploaded this item on GraphicRiver, you can see it here UPDATE: High Quality image
I can’t understand why it has been rejected, I have followed all rules about uploads, but it didn’t change anything.

Someone can give me any feedback?

Thanks in advance.

I think is a problem of quality of the vector elements

try to create something in a more modern style

I think very primitive sorry

Thanks for help!