More work of course, but you can also draw your own scalebar, and then label it as you please, in CC3+. If you set the grid scale correctly, and use the "Ortho" and "Snap" commands, it's not as difficult as you might imagine. Might not be so artistic as some of the symbol scalebar options though!

As Sue suggested, something to help the bars look more vertical probably would be helpful.

Maybe think of reducing the intensity of the shadows overall, given they don't really work with the light sources in the dungeon.

Some of the shadows - for the buckets and smaller round table - are also perhaps too large for what they are. The buckets probably shouldn't be casting the same length of shadow as the rack and dissecting table, for instance.

Might want to tweak the angle of the seating a little for the rows nearest the outer walls; otherwise, patron complaints about stiff necks can be expected!

Will there be upper levels too?

Yeah, but aren't they for the contours, rivers, roads - Oh wait... 😉

Not sure about the strength of the "Copyright Bay" label either 😎

More seriously, the green skull with horns looks too pixellated to my eye; seems not to fit well with the rest of the map's style and clarity, though I appreciate that's entirely to do with the original source illustration, and not something that can be fixed without some serious redrawing.

Depending on what kind of look you'd prefer, and also what sort of land area you want to map, you might also look at World War 2 Area Maps (which has options for illustrative contour lines), Cthulhu City (which also includes illustrative symbols for a selection of building types, albeit with "Call of Cthulhu" elements about some) or the Tactical Maps pack from last year's Annual.