in the first one, I think the top should be cropped off, and if the foreground is going to be that dark, might as well make it a pure silhouette and black it out entirely.
In the second one, what focal length are you using? It seems a bit too compressed to really impart a feeling of openness. It's a good picture, but I don't get openness. I usually think to make someone feel openness you need a very wide focal length, so that the scene envelops them. Even viewed really large, the picture seems far away.