It does what it says on the tin.

I had an image I was playing around with in img2img to generate various paintings of a girl. When I added in this extension it made the style a lot more drawn looking.

Overall I find the effect to be quite pleasant.

Here I'm using the 526mixV14_v14 model in img2img mode.

These painting "Morning" by Tatiana Yablonskaya (1954) was used in the generation of these images.