Rejection of PNG illustrations due to quality issues

[Icons8]

Hello,

Could you please help us understand the reasons for the rejection of these raster illustrations (quality issues)? 

The content was created without the use of AI.

We would appreciate any insights you can provide. Thank you!

[Abambo]

5. Halloween is one word.

[Abambo]

You've created the transparent wood: 

and your lines are aliased: 

[Jill_C]

A few drawing errors noted here.