I played around with the toon filter in GIMP. The results are better than if I do it in Poser, but I don't like that I don't have much control over how thick the lines are. I do have control over how dark they are, and GIMP toons the whole scene, whereas Poser just does a general outline type of render.

Here is the finished product.

If I had a nickle for ever time a woman told me to get lost, I could buy Manhattan.