To me, the foreground in the second picture distracts me. I'd like to see it cropped, with the bottom being just under where the trunk on the right goes into the ground, and the left edge being far enough in that there's no sky at the top to the left of the dark tree, but leaving the dark tree in. That gives an uncluttered foreground, the water, a little sky, and most important to me, a smooth progression of dark to light across in the trees.
I don't care for the first one, but I don't really know why. Just a matter of taste, I guess, or I just don't understand it. I don't know what that shape is at the top, so I either need more of it, or none of it. It confuses me. (Not a hard thing to do, actually.)
On the third one, I'd like to see less bright empty on the right, as if the camera had been turned just a bit to the left.
Good stuff, though.