Really great tiles, I simply love the BW feeling we get from them.
However, if you don't mind, I'd like to make a few suggestions (two, actually).
First, the boats in Castelia City. They are all facing West, but, the way they are, they can't depart to West (at least the two leftmost ones). They should be facing South, so they can actually leave the port.
The second suggestion is about the lake in Nimbasa City part 2 (it's a lake, right?). Well, it doesn't really look like one. I don't know what, but I think you could so something to the water or to the edges to make it seem more like a lake. Maybe some waves could do it. I know there aren't waves in lakes, but a brief moviment to the water could make it look better.
Anyways, these are definitely the best tiles I've ever seen, you're really great.
By the way, I'm Brazilian, so I speak Portuguese too. If you want, we can talk in PMs in Portuguese =) (I believe it's easier for both of us xD)