What can be the reason for the rejection of quality issue, and how can I improve?

Envato Authors Graphics Authors
1

Screen Shot 2022-04-19 at 4.02.25 AM
Screen Shot 2022-04-19 at 4.02.25 AM1152×1052 147 KB

Cartoon-Halloween-Characters-Designs
Cartoon-Halloween-Characters-Designs2000×2000 294 KB

2

Looks like free vectors

3

I’m sharing the vectors on veectzy also so that’s why my style is like this, can you please tell me how can I improve to make it live on market?

If this can be accepted why not my artwork?