How to scale the tileset?

Question

2D

This is my first time creating maps from tilesets. I work for Tiled. The task is to create a quality map layout like on the screenshot:


I'm still taking free tiles to figure out and understand what quality to buy tileset (if necessary), but I can't even get close to such a resolution as on the screenshot. There seems to be a 16-pixel grid (even here I'm not sure) but at a scale of 500%. At the same time, nothing is smeared, all borders are clear, each conditional "pixel" in the stroke, in fact, takes about 3. Maybe it's a vector set? Then how to work with this, only in paid software? The free Tiled works basic with PNG.
So far I'm getting some kind of scribbles (((

This is a 100% scale of a 16-pixel tileset.
When zoomed in to 400%, it starts to vaguely resemble a sample, but is still far from it.


Please tell me how to achieve the quality of the card as in the example on 1 screen.
thanks for watching <3