Floating Cave?

An illustration based on some design I had made for a motion project.

Opening Scene Storyboard

I've been working on a story for about three years now, called Feyir's Crux, and this is a brief storyboard for the last half of the opening scene. I wanted to get to the action, so the beginning is cut out, but it begins where we follow an aggressive young boy and his friend that have been re-captured by a band of 'pirates' (I hate how that word has so many cliches attached to it. I like to think of them as just a bunch of assholes on a boat, really. No parrot, no peg leg, no "Arrrrrg" crap). The boy continues to defy the captain who then threatens to throw him overboard.

The boy responds by...