Yep, you're right about Tokyo - there are more weird and wonderful creature to have taken that city apart than any other.

As for the focus - as long as New York City appears on the map you're fine - so a state map with New York labeled would be eligible.

And yes, just because one person has 'staked a claim' in no way precludes anyone else from doing the same thing.

I'd just like to note - front page of ArtOrder today! We got our very own post from the Wizards Art Director all to ourselves for this challenge so welcome to all Artorder readers that have found your way over here!