
1. grayscale thumbnails in Photoshop
2. convert image to pure cyan with channel mixer, print w/ color inkjet
3. tighten with blue pencil over printout
4. black pass with Verithin pencil/hb lead
5. scan, hue/sat out the blue/cyan
6. multiply line art, tweak levels

Shuffled the figures around so they don't look as bunched.