If you're an artist on the internet, GLAZE your artwork. You don't know who else is going around messing with your stuff so grab it here: glaze.cs.uchicago.edu Dude tried this with other pieces I had glazed and came out with erroneous outputs worse than this.

This can't be used without a computer though, right? ☹️ I do all my work on an iPad so this isn't readily available for me.

Nightshade also works very well specifically for heavily textured paintings, however if you plan to use it then add glaze as a final step and don't touch it again after the fact. If you're someone who does colour flats and cellshade like me, the combined result will look more like Glaze 1.0

*only* 4 hours to go before Glaze download is finished. When i saw Nighshade i liked the residual artifacts a lot, tbh. They gave a watercolor paper effect that i might decide to keep when i start testing.