Your suggestion with the witch - is cute....
But actually I sort of love the idea of making it look more real-life
In the original design I love:
the Sun, and solar glare
the shimmering waters
and the wavy ozone in the south...
Not sure if it is possible or likely, but I'd suggest to try to make it look like a real world seen from space instead of a cartoonish feel... But that's just my opinion.... And I'm a noob....