1. i like it but i think that if the sun and grass were not on the same side of the frame, it would help create a more balanced image. I think that the grass is a nice addition to the image and makes it more interesting than a regular sunset. the colors are great as well. I would crop some off of the bottom though.
2. i like this one the most. it would be better if the closest land wasn't black, but there isn't much you could have done about that. I would crop it so the water line isn't tilted though. The cool colors are great for the shot and the sun behind the mountains looks great.
3. a tad over exposed. i would darken everything a little bit, but the mountains more.
overall, not too bad for just getting into photography. keep working at it and you'll start to see what works and what doesnt.