I really like the first 2. The second 2 not so much
1. I like the scenery and everything, but i think that the bush blocks a lot of the rock. Can you push it away or get closer, lower, and wider? Other than that its great. The only thing that bothers me is the bush in the way.
2. I think the horizon is pretty cool. i like how it curves up at the ends just a little bit. There doesn't seem to be a real subject but its pretty cool nonetheless.
3. the background looks cool but its too dark to see
4. no face and he is riding out of the scene