Digital art not accept

You need to refine your cutout skills. Your cutout is a mess.

I did put a blue line around every bit of transition between transparency and opaque, and instead only showing up at the asset's contours, half of your asset turned blue. If you use an automatic cutout tool, stop using that. It will create a lot of trouble and does not work correctly at the level required by Adobe stock.

Jagged lines and a soft, unfocused appearance in some of the elements.