Spirit Magazine portrait

This is the first of a monthly illustration assignment I'll be doing for Spirit Magazine. It's the in-flight magazine for Spirit Airlines. Each month will feature a different, prominent business-person (mostly company founders, I think), and some of the history and philosophy of their company represented by a sort of brain-map. The brain-map was the art director's idea, and took some time to get to work.. but I think I've figured out a good process for future portraits.