The first picture is alright. I like what you tried to do w/ the sunset and silhouette. The only problem is it looks to me like you're not sure if you really wanted to do that or if you wanted to expose the beach. My advise on that picture would be to either. The easy way to fix this would be to crop the bottom out a little bit. Definitly leave a little bit of the land, but get most of it out. or expose a little longer and get definition on the beach.
I really like the second one a lot. The people add a nice touch. I'd also say take a little bit of this out, but not nearly as much.