Hey all its been years since I worked on a spot that need Super perfect Green Screen Compositing. I'm on a job right now and I'm having the hardest time with the Hair. Any help would be greatly appreciate. The pictures are below.
Separate the areas- a different key for the hair, body and hands.
For hair and hands, you may want to use 2 layers- one with a tight key using a Matte Choker, the second with a slightly feathered edge ( more feathered for moving hands) that has a correction for the green spill to match the background color and transparency.