How Can I Mask Out Everything But Eyes?

I want to film a close up shot of some eyes and I want to black out every feature except the eyes. How can I go about doing that?

I have a green screen
I have some lights for a well lit green screen shot

I'm just unsure of the process in Resolve to achieve my "eyes only" shot.



Thank you,
Harry

Create a Power Window spline shape and track 'em.... separately or as a single unit, depends on the geometry and organic motion. Create Outside Node and make black.

jPo, CSI

Don't use green screen and do what JPo says. It's the easiest way.