The most frequently given tip for landscape photography is lighting. Most landscape photographers avoid shooting between the hours of about 10:00 a.m. and 6:00 p.m. You can still get some amazing shots during those hours of the day but it not as easy.
The best example I have of lighting having an impact on a scene are the two photographs below. They are both beautiful shots of almost the same subject. The first picture was taken about 8:00 p.m. and the second about 8:30 p.m.
The second picture has much more drama and mood to is than the first. Some people like picture one better than picture two. Personal choice will determine what you want your photography to say about you.