face paint with green screen background


Hello, I'm fairly new so please forgive my lack of terminology.

I've got a project I'm working on trying to have a characters face over my own with a greenscreen background.

I've used the face paint template and successfully rigged the image that I wanted to, but now don't know how to treat that as it's own layer and give it the greenscreen.

I hope this is enough info to start.

Also as an aside, I did this work over a year ago and there seem to have been several updates since. Has anyone else had a buggy experience with projects made on an old version, having crashes etc...