A loose sketch of the main character:
And a quick stab at building him in 3D:
He's going to crawl out of a hiding spot, fly through a mostly procedural landscape that looks a bit like coral reef for humans, fly up through the clouds (out of the water), and toward a moving city that looks like a giant spider or squid or predatory fish or something--haven't quite decided yet. I'm looking to change it up a bit once I get things built, I want there to be the epiphany moment of 'woah, that city is alive!," or "that spider is made out of humans!"
Here's an animatic with drawings and blank solids for placeholders: