Here are my thoughts, I hope they help:
#1 - Dramatic, and nicely exposed, this would make a good background, if there were something for a foreground.
#2 - Technically well-done, but there's nothing of particular interest about the shot or the angle.
#3 & 4 - I really like the idea. It would be helped by having something, like a child or puppy, in the light area. Or something totally offbeat and unexpected. Also, exposure is too dark and then too light. This scene would be a good candidate for HDR, although I would leave the bushes fairly dark to better focus attention on the light. I like the intimacy of the scene.
#5 - A nice capture of the bark texture, but what makes this type of photo work best is when there is something to break the monotony - like a bug or lizard off to one side.