Use free select tool and select cat's eyes and nose. And feather 15 pixel.
Selection invert.
Right click on image, and choose "Filters - Artistic - GIMPressionist". Choose preset "mhgogh".
Click Update and click color tab, set Color noise 20 and click OK.
"Filters - Enhance - Despeckle", checked Recursive only and set Radius 1, Black level -1, and White level 256.