Composition of one is excellent, but I hate snakes so that put me off a bit once I saw the resemblance! As something I noticed, and I would say it is not a problem because it is grass and it gets blown over in the wind etc but that is the converging verticals with the grass in the water bottom right. Your choice if this is a problem or not.
Second is gorgeous, I really like the light and the shot. Shooting 'through' vegetation or trees like this is quite artistic I think. I would however clone out the piece of grass that is laying down left to right and not pointing up into the scene.
Third just makes me want to be in Snowdonia, I looked at it for ages.