Green screen compositing

I wanted to test that the green screen for the fantasy world would work. So I took a short shot and tested it in After Effects.

So before and after shots:

It seemed to work really well, and didn't take long at all. But I noticed that the tree in the back ground, which was out of focus, was a little pixilated. I thought it might have something to do with it being out of focus, so there isn't an exact line between that and the green screen so After Effects had trouble compositing out just the green screen. I will have to check with Stan the technician about this issue.