ai works in png format were not accepted

I looked at just the first one, in which the edge cutout work is very inconsistent resulting in some very blurry areas.

Who did the cutout work? There are many opportunities to get the wrong, too. All have very probably cutout issues. But on the screenshot, I can only do guesswork.

You should post the original files as submitted if you want a correct assessment. When you are doing a screenshot, we do not see what the moderator saw.

But even on these stamp sized screenshots, I see major issues and probable cutout errors.

etc...

First of all, are these the original? They are labeled "screenshot".

Do they have transparent backgrounds? If not, they should be .jpg.

Look at the edges and of the mutalated blossoms. There are a lot of rendering errors.

Images without transparent backgrounds need to be submitted as JPEGs, nor PNGs That said, were you given a specific reason why they were rejected? Quality issues, for example? There are dozens of rendering issues involved if so.