If you haven't installed the Krokodove plug-ins do so immediately. They are IMO must haves if you're running Fusion. There is one called Painterly that will apply a painterlike effect. Far from ideal, but it's a nice start.
www.krokodove.comIn the past I've used the Monster Plug-ins, now part of Genarts. I don't know if Fusion supports the current version of the OFX plug-in. But there was one in there that could create pencil-like strokes, based on luminance values. I've used that to create a 'Take on Me' kind of look about 8 years ago.
There is also Crosshatch and similar plug-ins from the Genarts Sapphire range, that are supposed to work in Fusion as well. But as with all things, plug-ins will only get you so far. If you start out with the right make-up and clothes, that will maybe get you halfway there allready.