Hi there,
your project caught my attention as something that I would very much like to do. I\m not sure what kind of illustration are you looking for - whether an artistic take on the differences of a schizophrenic and bipolar mind or a medical illustration, but in both cases, I'd be interested in the project for both artistic and personal reasons. I have a very close bipolar friend I'm somewhat familiar with the both difficulties and the advantages the condition brings. However, given the common manifestation, if you are not seeking only artistic approach, we could work together on the details of the illustration.
As for the stylistic and technical side - I'm an old school illustrator that means that I only work by hand on paper. If you would like a handcrafted, original art that I would deliver as a high resolution scan (or the original, if you would be willing to pay or the postal expenses), please check my portfolio and contact me if you are interested.