I'm hungry, I think I'd like a slice of pizza. Oh... you meant the photos. Artistically and technically, I prefer #3; I think though it would be an even stronger image if composed so that the three was "moved" just far enough to the right to allow the viewer to see the RH bank of the stream.

I like the effect in #2 - it's an interesting image, and if you crop the top stream bank out, you get a very 'out-of-this-world' image. Not sure what it is, but there's something in #1 which bothers my eye; I think it's the fact that I'm having difficulty discerning detail in the leaves.

Still, I'd say you've got the HDR thing under control!