In the atlas. Thanks.

Tiresia is now in the atlas.

As Wyvern says, you can add pretty much what you want. The idea behind this project is that everyone can bring their own ideas to the table. A local map should obviously be consistent with the regional map it is taken from, but the general idea is to make it interesting by adding features and locations that wouldn't have been mapped at the greater zoom of the parent map. The marked city locations on the parent map are naturally going to be the largest cities in the region, but as you drill down to more close-up maps, smaller cities and other interesting locations will naturally start to appear. So make it yours, add your own lore to the area (if you want to), and make it an interesting place for subsequent mappers to pick for their maps.

Looking nice. I like the way you place man-made structures.

I like the more natural feel of the map. I think it works better as a computer game map as well with the zones not so obvious. They're still there, but more blended into the map. And whenever a pure zone-map is needed, it can be handled by border lines or overlaying partially transparent polygons to introduce color variations.

There are no specific assets for this kind of map that I am aware of.

There are some extra textures and symbols for Cosmographer through the two HiSpace issues in the Annual Volume 6. None of them are exactly what you are asking for, but they do give some additional options, including worn, dirty and rusty stuff, which can make it easier to approach making the kind of maps you want. I find those textures very helpful when I don't want shiny new stuff.

To add a bit on to what Wyvern said, note that a lot of programs, especially those online browser-based ones, do not allow you access to download the artwork, they only make it available for use within their own application. I don't know the specifics of each of the programs you mention, but it isn't unreasonable to expect they are not downloadable in a legal way, but as Wyvern said, you need to research each of them (or maybe someone here who uses them can comment)

Just to confirm what others already said, yes, you can add additional details to local maps. That's the main idea, and the same thing you see in any printed atlas. The country maps only have the major details, but the regional and local maps have more details.

Obviously, the local maps shouldn't add features that are so large they should have been on the higher level map. For example, it would be weird to add a major river or a capital city if those weren't on the larger scale map, but adding smaller features, like settlements smaller/less important than those on the main map, smaller rivers, and so on is completely fine.

After all, if you don't add any detail to the local map, it hardly have a reason for existing at all.

As for naming, I think most features added to the map should be named. Names make it easier for those making lower-level maps to be consistent, and it makes a map into a map. After all, a map is for showing where things are, it is a map after all, not an aerial photo, and without names it gets kind of meaningless. Humans tend to name every feature around them, and my line of thinking is more along the line of "If it isn't worth naming, do it really belong on the map at all?". Some symbols may appear just for decoration and naturally don't get a name, but otherwise, most features should be named; settlements, rivers, oceans, forests, mountain/hill ranges, points of interest, major areas, etc.....

Detail maps will typically have more than enough new features to name.

His map seems to be made up from Resources from CC3+ Core, Perspectives 3, SS5 and SS6.

You can easily check where a symbol comes from by going to Symbols -> Symbol manager, selecting any symbol (including one of the red X's) and hitting the List button. This should show the file path to the art file used (among other information), and it is usually not too hard to figure out what it means, for example all SS6 resources have SS6 in the path.

You can do the same for fills by opening up the fill style dialog, go to the bitmap files tab, picking any fill in the list, and inspect the path shown in the appropriate field.

In-post forum images needs to be kept to a reasonable level out of consideration for all the various users, but if you want to provide a link to a higher resolution gallery image, you can just right click the image thumbnail in the gallery and pick "Copy link" (Slightly different name in different browsers) and you get a link straight to the relevant image you can paste into the post.

Please do make sure to make it into a hyperlink though, and not embed the actual image, as that will force everyone that opens the thread to download the full high resolution image, which is really bad for people with slower connections or even metered connections, like mobile plans. To avoid embedding it, simply type some text on the line before the link, like I did below (Forum will automatically try to embed it if you just paste the link on a line by itself.)

Like this:

High resolution version here: https://forum.profantasy.com/uploads/galleryplus/539/f30IY0FX345EK.jpg

Or even by manually making the hyperlink:

(High Resolution)

These symbol catalog settings are stored as .sis files in @System\Symbol Catalog Settings, so one would have to manually make copy of these for use in new installations. (And of course, there are the new symbol catalogs themselves (the .fsc files).