Making a good landscape photo is just as much about the editing process as it is about shooting it. While everyone has their own style, there are certain fundamental editing skills every photographer should know, and this great video will show you what they are and how to use them.
Coming to you from Mark Denney, this fantastic video details six different editing techniques every landscape photography should know how to employ. One of the techniques that I think does not get utilized enough is split toning. A lot of newer photographers leave the panel completely untouched in Lightroom, but it is important to remember that color toning is one of the best ways to add a personal touch to photos. Furthermore, just a light touch of split toning can add a lot of atmosphere to a photo. The important thing to remember (especially with any color adjustments) is to keep it subtle and not go overboard. Try stepping away from your screen for a minute after you're done editing before you evaluate the image one more time before exporting. Check out the video above for the full rundown.
And if you really want to dive into landscape photography and editing, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi."