You know, I've been using Adobe After Effects off and on for four years (nearly five now, good lord time flies) and I still know very little about how to use it. I suppose it is just that I so rarely do chroma keying effects, that I'm not really up to par. As the saying goes, practice makes perfect, so I'm gonna have to practice a bit more to get better.
To be fair though, these effects are two years old. I just now got around to shooting the scene with the human actor; before that, the video was just collecting dust on my laptop.