How I actually did it, is I lightened the house drawing, drew the snow on a layer over it, masked white between the layers to fill in the snow, restored the house lines to dark, and wallah! Winter in Big City.
I'm a native Chicagoan who grew up with strong winters. I also lived at over 8k feet elevation in the Colorado Rocky Mountains.
I know snow. I know how it lands, drifts, clumps, and melts.
But if I didn't. I'd do the research.
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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.