Yea, you can put a lot of things on small islands. I've been to a couple of the Caribbean ones. Barbados for example is 169 square miles, which looks about similar to yours in size, and has a population of 300 000 and lots of interesting locations.

There is a list of fonts on the FAQ page for the atlas, but it is quite a bit outdated by now. I don't know of any other lists.

As for license questions, those are best sent straight to ProFantasy

Thanks @Wyvern, the maps are now available in the atlas.

Thanks @Quenten, map is now in the atlas:

This is due to the setup in that traveller catalog you are using. For the standard traveller map, a gas giant is treated as a modifier to an existing symbol, to be displayed in the corner of a hex, not in the center where a regular planet goes.

This means that the symbol is quite offset from it's origin, which should be noticeable already at 1x scale, but as you scale up, distances are also scaled obviously, meaning that distance is now 16x larger. (This special placement for traveler is also why it is so small)

The gas giant in the regular planets catalog is more normal, but that is a height symbol, which isn't what you want here.

My recommendation is to create your own symbol catalog. Just make a copy of the traveller one, and then go in and scale all the symbols so they are properly scaled related to each other, and not for the abstract traveller use, and change the origin of the gas giants to be in the middle of the planet.