A bit of an experiment, and not quite hitting its target, but the look is pretty interesting nonetheless. I don't know that I'll make much use of it, but I'm happy to share it for anyone that might know what it's good for!
I preface my prompts with 'pencil contour drawing' and it's almost delivering on that. A proper contour drawing doesn't contain the shading that's heavily present here, but I do appreciate the line thickness variability. So there's some elegance and appropriate chaos to the output that's reminiscent of the sort of drawing I'm looking for.
If you're really curious, I generated training images with IP Adapter and just one reference, differently cropped. I didn't actually keep most of my old art school contour drawings. They're more an exercise in looking and relaxing the hand than they are to generally create great drawings. Still, I always liked the particular self portrait, below. Ultimately, if I'm going to really train a decent contour drawing model, I need to draw more training images.