CGI is pretty damn fascinating. It's one of those things, for me, that I try really hard to figure out how they do it, then get frustrated because I just can't do it on my own.
Now we can see how they did it for The Beast in Beauty and the Beast. It involved a huge pillowy suit, some stilts, and a lot of facial expressions being reenacted.
The fact that Emma Watson was able to keep a straight face with this is the real reason she deserves an award.