I've actually made each of Firestar's three main designs before. Years ago. But, there was one of her alternates that I always really liked and hoped to get to at some point. That being her darker Exiles design. She was one of the last members added to that spin off Weapon X team. Didn't last too long, but I really liked her look.

Sculpted up the collar and the hair. From there, just a full repaint, and all done!