If you're working with a character dressed in red, the first thing you must sacrifice is subtlety. Red is an unforgiving color. Its value range starts with a medium dark, and only goes darker from there. You can create beautiful value shifts within that range on your original, but less than a quarter of them will reproduce in print. Luckily I'm not working here for reproduction, but I still want to take a dynamic approach. I want to go very dark in my shadows to compensate for the value vampire at is red.