Contrary to popular opinion, there isn't a 'Art Post Minimum' to maintain an account on Newgrounds. :P
Heck, in 2016 at film school I only posted a single thing. lol
Maintaining regular art practice is a good way to avoid getting rusty, but if 'obligatory posts' become the norm, it takes away from spur of the moment inspiration.
So don't make art because you think 'you have to', do it because 'you want to'. :P
Only keeping yourself alive with food, water and oxygen is obligatory, posts online are not. haha
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All that said, interested to see how your comic/toon turns out!