Please! Calling all illustrators. Really need feedback on this. Hard Reject

Here is my second submission to the market. Yet again, another hard rejection. Finding the fact you receive no feedback highly frustrating and very tempted to move onto another site. Does anyone have any feedback or suggestions, before I do so?

I made sure to be careful yo rectify all previous mistakes. Only issue I realise is. I occidentally see a mark on some of my preview images (this is not one of my preview images). But this was easily fixed and don’t believe it would warrant a hard reject.

I mainly want to know, if people think this is just poor quality or has been rejected for another reason to avoid for future attempts?

Any Illustrators out there who can give feedback?