Very nice! I like the whole underwater idea, you pulled it off quite well. I don't think I've ever seen it done like that before. Good job on all of the little details too!
Light travels faster than sound, which is why some people may appear bright until they open their mouths.
I love the underwater scene you depicted, that was really neat.
The burps look perfectly fine, they blend right in with the landscape.
Excellent scene overall!
I like this. Wish I could give a good reason why, but it just seems pleasant to look at. And I personally think burps may be shunned more than they deserve. I wish they had been around when I was a kid.