The beautify filterset for the Gimp aren't part of the default set. On linux, use apt get to install gimp-beautify, and there's something similar that can be done with windows and Mac.
Finn dozing, sketched
Applying the life-sketch filter in beautify results in a pretty good simulacrum of a charcoal sketch.
Classic Sketch filter
And the classic sketch results in a artistic effect.
The only trouble with the beautify effect is that it's slow on my limited hardware.
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