Did you make any other posts? If that's all you did then I don't really know what got you banned.
You can review the forum rules here:
https://www.newgrounds.com/wiki/help-information/forums/forum-rules
Most of Newgrounds is manually moderated, so I don't think you were autobanned. Not sure, only autobanning feature I know of is in the Portal.
Maybe you can PM a forum mod and clarify with them, you can find a list of mods here:
https://www.newgrounds.com/wiki/help-information/site-moderation
altomare14
also please tell me if the image isnt loading