Definitely charge your art! Your style screams fabulous giorno too
I’m pretty sure most of people on forum want free art, but there’s still a few people willing to pay! Also don’t be afraid to put the price high, charge for the amount you think it’s worth your time and anything 
keep up your work!!
Also, I’d recommend promoting on instagram as there are more adult author who’s willing to pay for art (speak from my experience)