The first is well over-exposed, with a completely burnt out sky - you just need to keep an eye on your exposure settings (when reviewing shots, you might find it useful to have your camera tell you what's over exposed with flashing highlights).
The second needs to be straightened - the horizon isn't quite horizontal, and I would try playing around with the subject matter, maybe get something interesting in the foreground. Very nice location from the looks of it, but I would try shooting at dawn/dusk for some more interesting light.
Hope that helps.