@AnarchBoy67 I had to look up the character you drew to get to the bottom of this.
Around the time Trump got elected, the rules for the Art Portal got extended:
"Creepy territory includes art of characters who are known for being kids, even if you've aged them up. Creepy territory also includes creating lewds of an OC / persona that was created by a minor, even if that character is an adult. Ask yourself how creepy you are being with the art you are creating and if it's creepy behavior, expect it to potentially be removed."
- https://www.newgrounds.com/wiki/help-information/terms-of-use/art-guidelines
There have been a few removals such as this. Images from before the rule change are "usually" left alone, but I can not speak for NG.
Also: If you have the time, search for "Why was there no reason for the removal stated by the moderators?" here:
Yatsufusa's Frequently Given Replies
https://yatsufusa.newgrounds.com/news/post/1487260
Yatsufusa
Without context I cannot know what you are referring to, but if you were talking about NG:
There is no shadowbanning here. As in "We do not have a mechanic for that, so it is physically impossible for that to happen."
AnarchBoy67
I was apparently a lewd pic of riley but i made him appear older or at least tried to...but it got banned without notifying me..this has happened with my other art I did in the past..its just discouraging for me..thx for the info though