pen, markers, and gold gel ink on marker paper
Now, I'm not smart enough to toy with the representational/graphic dichotomy like Klimt without hurting myself. But I wondered whether that effect might work well to show how the energy is in Minnie's body but not really of this dimension.
pencils -> ink -> quick color studies
(Edit 8/10/15: I think this plot element is gonna be dropped. Going from overt scifi to a more real-world thriller kind of thing. Dang, it looked cool.)