To answer your reply on my comment, here's a comprehensive collection of guides & tutorials from @Yatsufusa - there's lots of helpful stuff in there that you can sift through and see what suits your areas of creation that need improving :)
https://www.newgrounds.com/collection/330234/guides-tutorials-other-help
Osaka
To be honest, based on your art you've submitted to the portal, none of it stands out as particularly impressive or groundbreaking. Not that it has to be revolutionary, but there's a sea of submissions in the art portal that have very similar styles.
If you're looking to reach a bigger audience and gain more support from others on Newgrounds, you'll have to do something that stands out at least a little bit.
Keep improving and try to bounce around fresh ideas you can incorporate into your work :)
Ryantenrec
like how can i do that to improve? whatdo i need?