@VanillaMoonCake Gacha Club is a part of those Gacha-type apps. Still not allowed. You shouldn't be uploading things that are against the rules that I linked you.
But I'm guessing that you drew this? https://www.newgrounds.com/art/view/vanillamooncake/vanillamooncake-me-2
You should keep at it. Your art style is cute. Focus more on uploading things that you drew yourself.
Mikoma
You should read this:
https://www.newgrounds.com/wiki/help-information/terms-of-use/art-guidelines
Did you draw them yourself, or did you make them in something like Gacha Life or other Gacha Apps?
Characters made using those apps are not considered original art since it's a character creator that uses premade assets. So they are rule-breaking and removed.
VanillaMoonCake
I just making in Gacha club but my art has got deleted...