Dibella's Watch

Also remember to keep scale in mind, else you'll have a monstrosity on your hands that will go forever

That's right. In the Hightmap Editor it's easy to go overboard and create these Cyrodiil-size continents. But you need to fill it all too, so keep it manageable.

Me thinks Dibella needs a more detailed map...

That's the in-game map. It's far more detailed in the game with all the map markers added and so on.