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i chose those screen shots out of several shots that i took because i thought they showed the best perspective view so you could get the idea what was around the lake.
as for the cave, it is just raised dirt (not cliffs), and the black part (entrance) is just the boundary tile. if you got some tips to make the cave entrance to look more real please share.
If i were to actually make a map with this i would also cut down on the many many doodads i used.