I wanted to try out some of the many grunge brush engines so did this scene with a cat in the window. Background reference is from a photo by Denny Muller on Unsplash. Cat is a random sketch.
I refer to “grunge” brushes as any of the stock Krita brushes that can easily be modified to produce random, broken textures. I used this one a lot in this painting. Some are pretty grungy just the way they are, like this one: