Hi!
Here's a guy checking if everything is reasonably leaking in the storage room
And here are some steps of the process. This started out as a random sketch never meant to become a full illustration. You can see I used the transform tool a lot to resize elements along the way:
I mostly used the Simple Flat Pen for painting and some Wet Ink for fog and tone adjustments using multiply and additive modes.
Original document is 5K wide.