I prefer the last one, but the first is nice too. Except for the shore, you'd need to add some rocks or veggies, or muddy areas/erosion. I think if you'd add some procedural grass or veggielike clumps under tree areas, it will be better also. And in the first one, the trees are rather evenly spread, if you'd patch them up more, it's more realistic, I think. Just my 2 cents.