Dude you already them but didn't you try like clean the line or sketch some like that
Like make a real art qwq
If you need some idea colors go coolors.com or colorhunt.com then copy the hex to your art :D but THIS AMAZING DUDE
ah I've seen clean art here, but I dont feel like doing it yet since I still need to expirement with some tools, but I will do it soon!
also thank you for the color suggestions, I will check them out ^^