CarTOONize your pictures using a script-fu script. Script has controls for adjusting the line thickness, as well as the 'black' shadows. Now you can adjust the number of color levels from 1 to 5 (the default is 4), 1 being very flat, 5 adding more color levels. Can enable/disable the black shadows, as well as a pre-filter * (It uses the GREYCstoration, G'MIC, Selective Gaussian, or Despeckle filter as a 'surface blur' to eliminate noise, which is user selectable). You can now either overwrite existing or generate a new layer.