I voted for DragonDePlatino, I would love to use this tileset. Though why is the shallow water(?) darker than the deep water? I don't think this makes much sense as the beaches I have been to have light shallow water and dark deep water due to seaweed and all that.
Second place goes to Sephiroth. Loving that dungeon!
I think the darker water is supposed to indicate how far the land continues under the water, as if you could see it from the surface. I think the 2 are interchangeable, but lighter shallows and darker deep water feels better for lakes and rivers in my mind, while the opposite for ocean shores.
DDP gets my vote. that tileset looks like it was drawn with ink pens and i love it