I lay some pre-made grids over the storyboard panel and adjust them with Photoshop's perspective tool. I eyeball it this time instead of using vanishing points.
The horizon line (dark blue) is near the top of the frame so we look down into the room.
Then using the storyboard as a guide, I rough in the architecture and major elements.
Though I used reference for the pirate ship, it's a theater stage, not a seafaring vessel, so I cheated a lot of the logistics of a ship.
How I drew this library with its curved, scalloped ceiling using 1-point perspective.
A TV animation background design step-by-step thread:
I start by planning my perspective over the storyboard panel here.
See my vanishing point in blue?
Placing it behind a shelf simplifies the amount of work. I only need to draw one row of shelving units receding in space. (A library is tedious to draw as it is.)
In this shot, the shadowed character on the stairs is important.
I make sure he's within the perspective of the left side bookshelves so they help guide the viewer toward him.