Pat & Larry Kytola wrote the book: How to Paint Flames. It's out of print, but I've seen it around in some catalogs. John Kosmoski's House of Kolor has a video where they flame out a Camero. The really good guys just take narrow masking tape and lay out the flames freehand. Fill in the rest with tape and masking paper. The skill/talent is in the lay out, color transition, and pin striping.
