You could try increasing the detail of the topography with more vectors or doing more levels to it or adding topographic rings to the mountains for height. You could add echo waves to the sea, or do ocean depth topography. You could put some of the text on curves, like the ocean text and mountain range text. You could add some more cartography markers, such as a scale or a compass. You could add docks. You could give it a slight texture overlay or creases, to make it look more like an in world in use map instead of a digital map. Just little things like that.