I really like the frost in the grasses and the lighting in the first image. I know you were shooting reflections, but I would have focused more on the grasses. With the second one I probably would have shot from a higher perspective - the background is somewhat blurred out, but it overpowers the stems in front of it. A more pure reflection with just the stem and the water would be nice. As for the plant stem in the third, I remember a photography book from a 'few' years back where the author admitted that for his first nature image he captured an owl (live), tied it up with some string and stuck it in a tree cavity. He didn't recommend such activity, though...
Mike.